Hydraulic reciprocating scraper rectangular pool bottom scraper is a hydraulic reciprocating rectangular pool bottom scraper that integrates continuous transportation and concentration of sludge. The rectangular pool bottom scraper has evolved from the first generation wire rope traction scraper type, the second generation crane scraping suction type, the third generation chain plate type to the current fourth generation hydraulic reciprocating type. The hydraulic reciprocating rectangular pool bottom scraper has the characteristics of fewer moving parts, less maintenance, continuous sludge transportation, high reliability, easy installation, and sludge concentration. The hydraulic reciprocating scraper has been successfully applied to a large number of different types of sludge sedimentation systems, with a wide range of applications.