Electromagnet is a kind of magnetic which have very wide application in industry. Some of the uses of these magnet can be used in magnetic trains, generators, Mir devices, speakers and electric cranes. Electromagnets in electric cranes is used for lifting and moving heavy pieces. The use of electric cranes has an old history and is used in various industries. The long-term performance of this machine in difficult condition of workshop and also imposed thermal and mechanical stresses during operation cause reduction in efficiency, consuming too much energy, crash and the loss of them. In this project thermal simulation of electro lifting magnet to analise proper working condition, reduce defects, damage to the magnets and also determine the limit of their performance is discussed. At first the geometry of magnet modeling has been discussed. In this way the outside geometry of magnet disc exact modeling with real dimension. The modeling internal coils execution with three ways. First the coil for an object with the equivalent size in the center and surrounding insulation was modeled. Then 1800 cycle of wire were modeled with 24 cycles and the next time with 70 cycle of hole and insulator that have the equivalent surfaces of the coil was modeled. With numerous runs and apply boundary conditions appropriate to consider the actual conditions of workshop results achieved. The results of these conditions were compared to each other and the results of an experimental work. After validity of results from simulation, proper condition for time performance and portable thermal load allowance has been provided in terms of temperature. The electromagnet disc without the thermal load and also the permanent connection thermal load with a temperature of 100 degrees Celsius for 3 hours. Insulation temperature does not pass the allowance limit and dose not damage to materials inside the electromagnet.connecting thermal load with a temperature of 200 degrees Celsius for the duration of 6121 seconds and thermal load with a temperature of 400 degrees Celsius for the duration of 1236 seconds, the coil internal temperature arrives respectively 148 and 151 degrees Celsius. Which destroyed the polymer chain insulators and loss of electromagnet. By applying different heat transfer coefficient on horizontal and vertical surfaces of electromagnet, the results of simulated external surfaces are much closer to the experimental results but on the inside surface temperature showed no significant difference. By increasing the thickness of the floor insulation of electromagnet, heat transfer with the environment as well as the external surface temperature was less so that the results accurately matches the experimental results considered. Now one can chose proper insulation thickness in magnet to control heat into electromagnet under high thermal load. Keywords : simulation, magnet disc, electric cranes, electromagnet, coil