Safe automatic constant temperature control system

Provided is a safe automatic constant temperature control system. An air cooler is in pipeline connection with a NO.3 air port of a positive pressure precision temperature control four-way valve; a NO.4 air port of the positive pressure precision temperature control four-way valve is in pipeline connection with a NO.2 air port of a negative pressure precision temperature control four-way valve; a NO.1 air port of the negative pressure precision temperature control four-way valve is in pipeline connection with a paint spraying-baking assembly line drying room; the paint spraying-baking assembly line drying room is in pipeline connection with a hot-air blower; the hot-air blower is in pipeline connection with an activated carbon adsorption and desorption regeneration device; the activated carbon adsorption and desorption regeneration device is in pipeline connection with a NO.1 air port of the positive pressure precision temperature control four-way valve; a connection pipeline of the NO.4 air port of the positive pressure precision temperature control four-way valve and the NO.2 air port of the negative pressure precision temperature control four-way valve is provided with an intelligent temperature sensor; a connection pipeline of the NO.1 air port of the negative pressure precision temperature control four-way valve and the paint spraying-baking assembly line drying room is provided with an intelligent temperature sensor; the intelligent temperature sensors are respectively in signal connection with an intelligent temperature controller; and the intelligent temperature controllers are electrically connected with the positive pressure precision temperature control four-way valve and the negative pressure precision temperature control four-way valve respectively.