Temperature and pressure reducing device capable of being automatically started

The invention relates to the technical field of temperature and pressure reduction, and discloses a temperature and pressure reduction device capable of achieving automatic starting, the temperature and pressure reduction device comprises a shell and a motor, the left end of the shell is communicated with a heat pipe through an upper water cavity, the right end of the shell is communicated with a temperature reduction pipe through a lower water cavity, and the communicating position of the upper water cavity and the lower water cavity is sealed through rotation of a valve body; a connecting rod is connected to the top end of the valve body, a hollow tubular through pipe is arranged in the middle of the connecting rod, a guide pipe is arranged in the middle of the outer wall of the through pipe, a cavity is formed in the top in the valve body, the right end of the cavity communicates with a cold water pipe, a disc body is fixed to the top of the connecting rod, and a gear ring is arranged on the outer diameter