The invention discloses an integrated constant temperature system of an automobile storage battery. A compressor (2) is connected with a plate evaporator (5) and a condenser (3) through pipelines. An expansion valve (4) is connected with the condenser (3) and the plate evaporator (5) through pipelines. A refrigerating fluid pipeline and a freezing liquid pipeline are installed in the plate evaporator (5), and heat exchange is carried out. A power interface (1) is connected with an external power supply and supplies power to the system. The integrated constant temperature system further comprises a controller (6), a freezing liquid temperature sensor (7), a freezing liquid pipeline interface (9) and a constant temperature system water pump (10). According to the integrated constant temperature system of the automobile storage battery, through integrated design, the unit weight can be reduced and the unit installation space is reduced on the basis that basic functions are achieved. Through the built-in controller, optimized control logic and switching of different modes, the temperature of the battery can be controlled within the optimal temperature range with the minimum energy consumption.