The invention belongs to the field of dust removal equipment, and in particular relates to a hydraulic dust removal device, including an induced draft fan and a hydraulic dust removal box, a vertical separator is arranged inside the hydraulic dust removal box, a first-stage filter net is arranged on the middle and upper part of the vertical separator, the vertical separator divides the hydraulic dust removal box into two chambers of a dust removal chamber and a water drainage chamber, the induced draft fan is connected with the dust removal chamber by a fan duct, the fan duct is provided with an air inlet valve, the upper end of the dust removal chamber is provided with a sprinkler system, a water inlet of the sprinkler system is connected with a water supply pipe, the water supply pipe is provided with a water inlet valve, a second-stage precision filter net is laterally arranged in the water drainage chamber, the position of the second-stage precision filter net is lower than the lower edge of the first-stage filter net, the upper part of the water drainage chamber is provided with a venthole in communication with the outside, the lower part of the water drainage chamber is provided with a water drain port, the position of the water drain port is lower than the second-stage precision filter net, the water drain port is provided with a water drain valve, the outer walls of the dust removal chamber and the water drainage chamber are respectively provided a manhole I and a manhole II, and the position of the manhole II is higher than the second-stage precision filter net. The dust removal efficiency of the hydraulic dust removal device is up to 80% to 95%, the dust removal effect is obvious, and the working environment is optimized.