Temperature regulating device of engine

The utility model relates to a temperature regulating device of an engine, which adopts large-diameter micro radiating circulation. The diameter of a micro radiating small circulating branch flow opening at the bottom of a temperature regulating seat is enlarged to be equal to the diameter of a water inlet pipe of an engine water pump, and a wafer at the lower end of the temperature regulator is correspondingly enlarged along with the micro radiating small circulating branch flow opening. The diameter of a micro radiating circulated water pipe on the water inlet pipe of the engine water pump is enlarged to be equal to the diameter of the water inlet pipe of the engine water pump. The utility model can effectively improve the running temperature of the engine in winter, ensures that good expansion gap is reserved between an engine cylinder and a piston as well as among a piston ring, is beneficial to complete combustion of diesel oil in the cylinder and stable output of engine power, prolongs the service life