Solution tank temperature control device

The utility model discloses a temperature control device of a solution tank in a test box, so as to solve the problem of difficult temperature control in the solution tank at the present. The temperature control device comprises the solution tank. The solution tank is connected with a replenishing tank through a replenishing tube. A heating rod is arranged in the replenishing tank. A cycle cooling water tube and a temperature measuring instrument are arranged in the solution tank. The cycle cooling water tube is connected with a water tank. The water in the water tank enters the cycle cooling water tube through a cycle water pump. A refrigerating unit and a heating unit are arranged in the water tank. When the temperature measuring instrument detects that the solution temperature deviates from the set temperature, the refrigerating unit or the heating unit is started to adjust the temperature of the water in the water tank, thus the temperature of the solution in the solution tank is adjusted. According to the utility model, the method of temperature coarse adjustment and fine adjustment separating is adopted to control the temperature of the solution tank, thus the connection between solution tank pipelines is reduced; no wire connection is in the solution tank, thus the electrical safety is improved; and a fine adjustment device adopts the cooperative work of the refrigerating unit and the heating unit, thus the control is accurate.