Water cooling device of cetane number measuring machine

The utility model provides a water-cooling device of a cetane number measuring machine, which comprises a water-cooling box body and a cover plate connected to the water-cooling box body in a magnetic attraction manner, the cover plate is provided with a movable assembly and a suction assembly used for adding cooling liquid, the inner wall of the water-cooling box body is connected with a water-cooling pipe used for cooling diesel oil, and in the running process of the water-cooling device, the water-cooling pipe is connected with the water-cooling box body. The floating ball is driven to descend along with descending of the water level of cooling liquid in the water-cooling box body, the pull pressure sensor fixedly connected with the mounting plate can detect pull force, and when the pull force reaches a preset value domain through setting of the controller, an instruction is sent to control the suction assembly to operate to add the cooling liquid into the water-cooling box body. The water level in the wat