Electric heating constant temperature oven is made of high-quality cold-rolled steel plate, the surface is sprayed with plastic treatment, and the inner tank is made of high-quality stainless steel plate. High-quality rock wool is used between the inner tank and the outer shell to keep warm. The middle of the door is equipped with a toughened glass observation window, which is convenient for users to observe the test conditions of the objects in the working room at any time. The temperature control system adopts a microcomputer chip processor and a dual digital tube display, which is convenient for users to view the set temperature (or set time) and measure the temperature. It also has PID adjustment characteristics, time setting, high temperature protection, temperature correction, deviation alarm and other functions, with high temperature control accuracy and strong functions. The blast circulation system sends the heat generated by the bottom heater into the working room through the air duct and forces the exchange and circulation of the hot and cold air flow in the working room, thereby improving the temperature uniformity of the temperature field in the working room.