Wind power blade flash cutting device and cutting method thereof

The invention relates to a wind power blade flash cutting device and a cutting method thereof. The cutting device comprises a walking cutting mechanism, a back gouging mechanism and a connecting rod assembly. Each of the walking cutting mechanism and the back chipping mechanism comprises an opening and closing rack, a cutting machine, a dust collection part and a moving part for controlling the cutting machine to move up and down and back and forth; a driving wheel, a power structure for driving the driving wheel to rotate and a driven wheel are arranged on an opening and closing rack of the walking cutting mechanism, and the driving wheel can be arranged in the flash groove in a matched mode and is matched with the driven wheel to clamp the two sides of the bottom of the flash groove. An opening and closing rack of the back gouging mechanism is provided with a clamping wheel which can clamp the cutting allowance left after the blade flash is cut by the walking cutting mechanism when the rack is closed, and t