Improved water bath box

The utility model provides an improved water bath box and belongs to the technical field of experimental equipment. Comprising a box body, and a plurality of baths are formed in the box body; a first constant-temperature heater, a liquid level sensor, a temperature sensor and a control panel are mounted in each bath; a controller is mounted in the box body; the first constant-temperature heater, the liquid level sensor, the first temperature sensor and the control panel of each bath are electrically connected with the controller; a plurality of preheating water tanks are installed on the upper end face of the box body, each preheating water tank is communicated with one bath through a connecting pipe, an electromagnetic valve is arranged in each connecting pipe, a second constant-temperature heater and a second temperature sensor are installed in each preheating water tank, and the electromagnetic valves, the second constant-temperature heaters and the second temperature sensors are all electrically connected