Constant-temperature oil supply device

The utility model provides a constant-temperature oil supply device. The constant-temperature oil supply device comprises a box body, a bottom cover, a piston, an oil supply port, an oil return port and a temperature controller, the bottom cover is arranged at the bottom of the box; the piston is mounted in the box body and can reciprocate along the box body; a spring is arranged between the piston and the bottom cover of the box body; hydraulic oil is filled between the piston and the top of the box body; the temperature controller is arranged on the upper side wall of the box and used for heating the hydraulic oil and controlling the temperature of the hydraulic oil. The oil supply port and the oil return port are formed in the top of the box body and are both provided with one-way valves, so that the oil supply port can only supply oil outwards, and the oil return port can only return oil inwards. The temperature control device is adopted to heat and control the temperature of the hydraulic oil in the hydr