The invention discloses a grass collecting head with a convenient winding structure. The grass collecting head comprises a base, an upper cover, a thread spool, and a mowing thread wound on the thread spool, wherein the base is clamped with the upper cover; the thread spool is assembled between the base and the upper cover; a thread clamping groove is formed in the thread spool; two ends of the mowing thread extend out of a thread outlet hole of the upper cover; a fixing ring is arranged in the center of the upper cover; a knob is arranged on the outer side of the upper cover and is matched with the fixing ring; a large compression spring is arranged between the knob and the upper cover; a screw is arranged in the center of the fixing ring and is fixed with the knob; a screw washer is arranged between the screw and the fixing ring; and a small compression spring is arranged between the screw washer and the thread spool. The grass collecting head with the convenient winding structure, disclosed by the invention, has the advantages that the structure is simple, the upper cover and the thread spool form a whole, winding is convenient and rapid, and the working efficiency is greatly improved.