The invention provides a special digital program-control four-arm multi-finger clean-keeping mechanical hand for the outer surface of a car. The clean-keeping mechanical hand comprises a stable and balanced track walking
steel frame structure, two horizontal wiping rotating arms, two suspended wiping rotating arms, an
elevator transmission structure of a forward-reverse
ratchet-wheel alternate differential-drive single-stranded rod TG254 special chain and a sealed flat circular standard chain, a suspended arm sliding rail
carriage combination transmission structure, a high-definition electronic monitoring and computer digital program-
control system, 120-degree horseshoe-shaped clearance-adjusting water nozzles, a hot-
air drying device, a manual operation panel, a four-wheel shield, a car walking part and a secondary-water recycling and purifying device for spraying and washing of the outer bottom surface, wherein a parallel-chord truss steel beam is connected with two memorial-archway-shaped stand-column steel frames composed of four
yaw-free track wheels to form the stable and balanced track walking
steel frame structure; the two horizontal wiping rotating arms composed of automatic inflation type
elongated fingers with milk white fiberglass
reinforced rubber terminals in a
tail fin shape and the two suspended wiping rotating arms composed of automatic inflation type
elongated fingers with milk white glass rubber terminals in a
tail fin shape are arranged at the
front edge, the rear edge, left end and the right end of the parallel chord truss steel beam respectively; and the suspended arm sliding rail
carriage combination transmission structure is used for connection of a worm
reducer output forward-reverse 30-degree
isosceles trapezoid lead screw and universal couplings. All program-control screens and switches are arranged on a cover type control platform, and the
voltage of 220 V is adopted.