The invention belongs to the technical field of brushes, and particularly relates to a cleaning brush with a quantitative liquid replenishing function. One end of a brush handle is connected with a brush head, the brush head is provided with bristles, the brush head is hermetically connected with the brush handle, inner cavities of the brush head and the brush handle are mutually communicated, the brush head is provided with a one-way valve, liquid in the inner cavity of the brush head can be drained to the outside of the brush head via the one-way valve by the aid of pressure, an inflating device which inflates the inside of the inner cavity of the brush handle is disposed at the other end of the brush handle, the other end, which extends out of the brush handle, of a touch rod of the inflating device is connected with a pressure cap, and more than one hydrophilic water storage material is arranged among the bristles on the brush head or on one sides of the bristles. The cleaning brush has the outstanding technical advantages that liquid outlet can be controlled remotely, and the cleaning brush is convenient in operation, saves washing liquid or water, is energy-saving and environment-friendly, protects the skin of a user, is low in labor intensity and high in work efficiency, and is applicable to washing pots and pans or walls, doors, windows and glass.