The intermediate frequency melting furnace has a high productivity, and the melting period can be shortened to about 35 minutes. In order to limit the power of the furnace, it is necessary to remove the slag as quickly as possible. The use of machinery to remove impurities or manually remove impurities , poor effect, long time, and poor working conditions. To this end, a method of pouring the slag back from the furnace is proposed, that is, the furnace body is tilted backward by 20-25°, and the slag is poured into the transport vehicle through the slot at the back of the top of the furnace body. This method is fast and convenient. After the intermediate frequency melting furnace is operated, it is necessary to repair the furnace. In order to shorten the furnace shutdown time of replacing the lining refractory, mechanized means must be used, and the vibration building machine and the lining machine are the main accessories of the large intermediate frequency melting furnace. The lining push-out machine can push out the lining refractory when it is not completely cooled, further shortening the furnace repair time and improving the working environment.