The invention discloses an automatic inclined type tray brush waterfall glass cleaning machine. A pair of linear sliding rails are arranged in parallel on a machine frame in the x-axis direction, a glass fixing table-board used for the placement of pieces of cleaned glass in an inclined manner is arranged on the machine frame, and a plane where the pair of sliding rails are located and the glass fixing table-board are arranged in parallel; a water pan assembling body is arranged on the sliding rail in the y-axis direction in a sliding and connecting manner, a vertical tray brush is arranged on a surface, corresponding to a glass placement fixing seat, of the water pan assembling body, and an adjusting cylinder is arranged on the water pan assembling body, and is used for adjusting the tray brush intaking depth and the tray brush intaking force in the z-axis direction. The vertical tray brush is adopted for high speed rotation and is vertical to to-be-cleaned glass, the intaking depth of the vertical tray brush is adjusted according to the set thickness and the pollution level of the glass, so that adhesive residue and stains on the surfaces of the glass can be cleared away more flexibly, conveniently and thoroughly; and a single-machine double washing structure is adopted, two sets of work stations are mounted on one machine frame, and during the running process, alternative operation production is achieved, the equipment use ratio and the production efficiency are improved greatly, and the production cost is lowered.