Constant-temperature water tank suitable for containers of various specifications

The utility model provides a constant-temperature water tank suitable for containers of various specifications. The constant-temperature water tank comprises a water tank body and a temperature control mechanism arranged on the water tank body, a bearing mechanism is arranged in the water tank body, and a covering mechanism is arranged at the position, corresponding to the upper portion of the bearing mechanism, of the water tank body. The bearing mechanism comprises a frame body, an upper frame and a lower frame, the upper frame and the lower frame are correspondingly arranged on the frame body, the upper frame and the lower frame are each provided with a limiting assembly, each limiting assembly comprises a transverse limiting piece and a longitudinal limiting piece which are horizontally arranged, and the transverse limiting pieces and the longitudinal limiting pieces are slidably installed on the corresponding upper frame or the corresponding lower frame. The constant-temperature water tank suitable for t