The disclosure discloses a protective cover quick-changing mechanism, belonging to the field of garden machinery, comprising a housing (1), on which a protective cover (2) is fixed, wherein the protective cover (2) is socketed on the housing (1), a fixing member (3) for locking the protective cover (2) to the housing (1) is movably connected on the housing, and an elastic member (4) for locking the protective cover to the housing (1) is provided between the housing and the fixing member. In addition, the disclosure further discloses a lawnmower using the above quick-changing mechanism. The disclosure has the advantages such as facilitating the user to disassemble and assemble the protective cover and improving the convenience.
