The invention discloses a special suction head for a window groove dust collector. The special suction head comprises a hollow shell body, wherein the upper end of the outer side face of the hollow shell body is provided with a connecting column, the left and right sides of the lower end of the inner side face of the hollow shell body are provided with two bilaterally symmetrically arranged sliding rails, the sliding rails are slidably connected with a second U-shaped plate through a second sliding block arranged at the rear ends of the inner side faces of the sliding rails, the sliding railsare slidably connected with a first U-shaped plate through a first sliding block arranged at the front ends of the inner side faces of the sliding rails, and the middle of the inner side face of the hollow shell body is provided with a sealing bag. The special suction head for the window groove dust collector has the advantages that the structure is compact, the operation is convenient, the spaceoccupied during the use is small, dust in a window groove can be rapidly cleaned away, through the arrangement of a first roller combined with a second roller, the suction head can move in the windowgroove very conveniently, and through the arrangement of the first U-shaped plate and the second U-shaped plate, the suction head can be adjusted very conveniently according to the width of the windowgroove.