A scraper device for filter plates of a filter press, comprising a fixed frame and a movable frame; the fixed frame being a framed structure comprising a support crossbeam and a main beam; the movable frame being a framed structure comprising a base, a lower frame crossbeam, an upper frame crossbeam, and a first column; wherein: the first column is fixed on the base and is connected to the upper frame crossbeam and the lower frame crossbeam; the scraper device further comprises a lifting frame and a scraper assembly; the scraper assembly is connected to the lifting frame; the movable frame further comprises a first gear motor connected to a gear through a first main axle, the gear fits with a gear rack which is disposed on the main beam; the lifting frame comprises a second motor; the second motor is connected to a chain gear through a second main axle; the chain gear fits with a chain; the second gear motor is connected to an upper end of the first column; the lifting frame is fixed in the movable frame and comprises an upper crossbeam, and a lower crossbeam, both of which are connected with a second column; the lifting frame further comprises a connecting plate; the connecting plate is connected to a slide plate; the slide plate comprises a chain hole and an anchor pin; a first portion of the chain passes through the chain hole; a second portion of the chain is fixed to the slide plate through the anchor pin; the scraper assembly comprises two cylinder assemblies and two scrapers; the two cylinder assemblies are connected to the two scrapers, respectively; the two scrapers are disposed on both sides of a filter plate; and an upper portion of the movable frame is provided with a limiting device; a clamping proximity switch is connected to the limiting device; an unclamping proximity switch is disposed on a lower portion of the movable frame; characterized in that each of the two cylinder assemblies comprises two cylinders, each fixed on a cylinder saddle that is connected to a cylinder base; the cylinder bases are connected to a crossbeam; each of the two cylinders is connected to a movable clamping plate via a cylinder connecting block; the movable clamping plate is hinged on a fixed clamping plate; the fixed clamping plate is fixed on the cylinder base; and each of the movable clamping plates is connected to the scraper holder supporting one of the two scrapers. the first column is fixed on the base and is connected to the upper frame crossbeam and the lower frame crossbeam; the scraper device further comprises a lifting frame and a scraper assembly; the scraper assembly is connected to the lifting frame; the movable frame further comprises a first gear motor connected to a gear through a first main axle, the gear fits with a gear rack which is disposed on the main beam; the lifting frame comprises a second motor; the second motor is connected to a chain gear through a second main axle; the chain gear fits with a chain; the second gear motor is connected to an upper end of the first column; the lifting frame is fixed in the movable frame and comprises an upper crossbeam, and a lower crossbeam, both of which are connected with a second column; the lifting frame further comprises a connecting plate; the connecting plate is connected to a slide plate; the slide plate comprises a chain hole and an anchor pin; a first portion of the chain passes through the chain hole; a second portion of the chain is fixed to the slide plate through the anchor pin; the scraper assembly comprises two cylinder assemblies and two scrapers; the two cylinder assemblies are connected to the two scrapers, respectively; the two scrapers are disposed on both sides of a filter plate; and an upper portion of the movable frame is provided with a limiting device; a clamping proximity switch is connected to the limiting device; an unclamping proximity switch is disposed on a lower portion of the movable frame;