Handheld window cleaning machine having wastewater separation structure

A handheld window cleaning machine having a wastewater separation structure, comprising:

• a shell assembly in which a water-air separation unit is accommodated;
• a water tank assembly provided at a bottom of the shell assembly, a wastewater separation unit being provided in the water tank assembly, an outlet of the wastewater separation unit being in communication with an inlet of the water-air separation unit;
• and
• a suction nozzle assembly pluggably connected to a front end of the shell assembly, such that the suction nozzle assembly is rigidly connected to the shell assembly, an outlet of the suction nozzle assembly being in communication with the wastewater separation unit;
• wherein an air outlet of the water-air separation unit is open outward, and a wastewater backflow opening is provided at a bottom of the water-air separation unit, and the wastewater backflow opening is in communication with an inlet of the wastewater separation unit
• wherein the water-air separation unit comprises a water-air separation body, a motor cover plate, a centrifugal fan and a motor, the motor cover plate is sealed and connected with the water-air separation body to form a fan chamber tor accommodating the centrifugal fan, a closed motor chamber and an auxiliary water tank transversely running through the water-air separation body are provided in the water-air separation body, the motor chamber is adjacent to the auxiliary water tank, at least one through hole in communication with the auxiliary water tank is provided at a bottom of the fan chamber close to a side wall of the fan chamber, and the motor is sealed and arranged in the motor chamber and is connected with the centrifugal fan arranged in the fan chamber.