The invention discloses a high-water-content composite waste rock filling hydraulic support frame, which comprises a side wall protection plate, a front top beam, an upright post, a back top beam, a waste rock filling scraper conveyor, a high-water-content material spray opening, a waste rock sliding opening, a telescopic L-shaped base, a push moving jack, a back top beam high-water-content material spray opening, a sealing iron plate, a high-water-content material conveying pipeline, a side wall protection plate jack, flexible sealing cloth, a telescopic jack and the like. The filling operation of the support frame comprises two steps of: 1, lower part filling; and 2, top connection filling. During the lower part filling, the telescopic L-shaped base and the filling body form a sealed space; the waste rock filling scraper conveyor conveys waste rock into a filling operation surface to be bonded with high-water-content materials; and the lower part filling is completed. During the top connection filling, after the frame moving, a part which is not subjected to top connection above the filling body is sealed by the sealing iron plate and the filling body for forming a filling space; the back top beam high-water-content material spray opening sprays out the high-water-content materials for filling the filling space; and one circulation is completed after the top connection is completed. The hydraulic support frame can meet the requirements of safety, high efficiency, green effect, environment protection and synchronous production and filling.