The chemical incubator has a two-way temperature control system for cooling and heating, and the temperature is controllable. It is a scientific research institution, colleges, universities, production units or departmental laboratories in biology, genetic engineering, medicine, health and epidemic prevention, environmental protection, agriculture, forestry and animal husbandry. The important test equipment is widely used in low temperature and constant temperature test, culture test, environmental test, etc. The biochemical incubator controller circuit is composed of a temperature sensor, a voltage comparator and a control execution circuit.