Water bath box structure

The utility model relates to the technical field of water bath heating, and discloses a water bath box structure which comprises a shell and a water tank arranged in the shell, a plurality of guide columns which are vertically distributed and fixed with the bottom of the water tank are arranged on the inner wall of the water tank, an annular lifting support is arranged between the guide columns, a lead screw parallel to the guide columns is further arranged on the side wall of the water tank, and the lead screw is connected with the annular lifting support. The two ends of the lead screw are connected with the side wall of the water tank through connecting bases, the lead screw is rotationally connected with the connecting bases, the lead screw penetrates through the annular lifting support to form threaded connection, and a rotary knob is fixedly arranged at the upper end of the lead screw; a test tube positioning support is arranged on the annular lifting support, a plurality of connecting lugs are arranged