The trolley type annealing furnace is a standard energy-saving periodic operation furnace, mainly used for quenching, annealing, aging, and heat treatment of various mechanical parts such as high chromium, high manganese steel castings, ductile iron, rollers, steel balls, 45 steel, stainless steel, etc. Composed of furnace body, trolley, heating element, temperature control system, and ventilation device, the outer shell of the furnace body is welded with steel plates and lined with insulation material. The trolley can enter and exit the furnace for easy loading and unloading of workpieces.