The invention discloses a loach washing pool which comprises a washing tank pool and a temperature control device. The temperature control device is positioned on the surface of the inner side of the washing tank pool, a water inlet and a water outlet are formed in the upper portion of the washing tank pool, the temperature control device comprises a display screen, regulation and control buttons, a control circuit board and heating plates, the heating plates, the display screen and the regulation and control buttons are positioned on the outer wall of the washing tank pool, the display screen is connected with the regulation and control buttons, the regulation and control buttons are connected with a power source by a switch, the display screen is connected with the control circuit board, and the control circuit board is connected with the heating plates. The loach washing pool has the advantages that the heating temperatures of the heating plates can be freely adjusted by a washing device according to requirements of users, accordingly, the temperature of water in the washing tank pool can be guaranteed, and the loach washing pool is suitable for washing fishes with sticky slime on the surfaces; the water inlet and the water outlet are formed in the washing tank pool, accordingly, the users can conveniently replace the water in the washing tank pool at any time, and the survival rate can be guaranteed; flexible plastic woven filter screens are arranged on the water inlet and the water outlet, accordingly, loaches can be prevented from escaping, and unnecessary harm can be prevented.