The invention discloses a brush capable of storing cleaning liquid. The brush comprises a brush board and a brush head, a storage battery, a motor and a rotor are arranged in the brush board, the storage battery is connected with the motor, the rotor is fixed at the bottom of the motor, a connecting rod is fixed between the rotor and the brush head, a switch is arranged on the side wall of the brush board and controls the motor, a cleaning agent box is arranged on the brush board, an opening is formed in the top of the cleaning agent box, a plug is arranged on the opening, a cleaning agent extrusion device is arranged in the cleaning agent box, and an extrusion pipeline is arranged at the bottom of the cleaning agent box. The brush can electrically rotate and is provided with the cleaning agent extrusion device, the cleaning liquid can be added when the brush is used, extra addition is omitted, damage of user skins caused by the cleaning liquid is avoided, and the brush is practical and convenient.