The invention discloses an operating room liquid constant-temperature box, and belongs to the technical field of medical instruments and apparatuses. The operating room liquid constant-temperature box comprises a box body arranged in a liquid cabinet. The box body is communicated with a heating chamber through an air inlet and an air outlet. At least one partition plate with holes is horizontally arranged at the portion, between the air inlet and the air outlet, of the box body. A temperature sensor is arranged in the box body. An exhaust fan is arranged at the portion, corresponding to the air outlet, inside the heating chamber. A heater is arranged in the heating chamber. The exhaust fan, the temperature sensor and the heater are all electrically connected with a controller. By means of the operating room liquid constant-temperature box, the problem that heated liquid for an operation can not be conveniently taken for use can be solved.