Folding type window cleaning device

The utility model discloses a folded-arm type window cleaning machine, wherein, a hoisting mechanism is connected to one end of a main suspension arm and a folded-arm amplitude variation mechanism is connected to the other end thereof; the upper part of the folded arm in the folded-arm amplitude variation mechanism is hinged with one end of a folded arm supporting plate and a folded arm oil cylinder is connected to a position between the upper end part of the folded arm and the other end of the folded arm supporting plate; the middle part of the folded arm supporting plate is connected with an upper swing mechanism connected with the main suspension arm in a swinging manner; the lower end of the folded arm in the folded-arm amplitude variation mechanism is hinged with one end of a lower arm head plate; a pull rod parallel with the folded arm is hinged to a position between the middle part of the lower arm head plate and the folded arm supporting plate; and the pull rod, the lower arm head plate, the folded arm and the folded arm supporting plate are hinged to form a parallelogram four-bar linkage. The utility model has the advantages of light weight, small size, flexible disassembly and assembly, convenient operation and use, high reliability, various operation manners and large operation range, flexible swing and expansion, complete safety control units, safe operation, simple processing and convenient maintenance, and can be adapted to the prior buildings and profiles.