Method and device for removing welding slag of crank disc

The invention discloses a method and a device for removing welding slag of a crank disc. The device comprises a positioning rotating mechanism which is connected to a rack and is provided with a rotatable positioning seat; a floating adjusting mechanism and a slag shoveling mechanism of a reciprocating scraper which are connected are arranged on one side of the positioning rotating mechanism; the outline of the edge of the scraper is matched with the shape of the upper surface of the crank disc; a jacking mechanism comprising a jacking head capable of reciprocating and freely rotating is arranged above the positioning rotating mechanism, and the jacking head is used for pressing the crank disc; the method for removing the welding slag of the crank comprises the following steps that S1, the crank is installed on the positioning seat through the positioning pin to form circumferential lateral positioning; s2, pressing a top pressure head on the crank to enable the crank to be positioned in the axial direction;