Replacing the water tank of the vacuum cleaner regularly can avoid the accumulation of scale and silt inside, ensure smooth and uniform water discharge, stabilize water seepage after mopping the floor, and clean the floor more evenly and cleanly. Replacing the water tank of sweeping robot and vacuum cleaner can prevent the aging box from cracking, water seepage and liquid leakage, prevent the machine body from getting wet, and prolong the service life of sweeping robot and vacuum cleaner. The replacement and adaptation of the water tank model of the vacuum cleaner is accurate in size, the installation buckle fits tightly, there is no need to modify plug and play, and it is simple to adapt to various models of sweepers and vacuum cleaners. The aging water tank is prone to water control failure. After replacement, the water control function of constant humidity is restored, and the water output is intelligently adjusted to meet the mopping needs of different floors of wood floors and tiles. Replacing the water tank of the vacuum cleaner can reduce the blockage of the water outlet by impurities, and the machine does not need to stop water frequently to dredge, thus improving the efficiency of sweeping and dragging and reducing the trouble of stopping and maintaining in the middle.