Test tube rack water bath tank

The invention relates to the technical field of water bath tanks, in particular to a test tube rack water bath tank which comprises a tank body and a test tube rack and further comprises a test tube rack lifting device. The test tube rack lifting device comprises two inverted U-shaped lifting racks which are symmetrically distributed on the two sides of the tank body. The tank walls of the two sides of the tank body are located in openings of the lifting racks. The test tube rack is located between the two lifting racks and fixedly connected with the two lifting racks. The test tube rack lifting device further comprises a spring abutting plate and a positioning shaft which are fixedly connected with outer side rack walls of the lifting racks. The positioning shaft is inserted in and penetrates through the outer side rack walls of the lifting racks from the outside of the spring abutting plate, and one end of the positioning shaft abuts against the tank wall of the tank body. A supporting spring is arranged at