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1. A lawnmower, comprising a power unit and a lawn mowing device, wherein the power unit comprises a base, the lawn mowing device comprises a blade holder detachably connected to the base, the base is provided with a first locking device for fixing the blade holder, the first locking device comprises a first installation rod on the base, first pins and first locking mechanisms disposed on the first installation rod for fixing the first pins, each end of the first installation rod is configured with a first insertion hole, the blade holder is configured with penetrating holes, each of the first pins penetrates through a respective one of the penetrating holes and the first insertion hole sequentially, each of the first locking mechanisms comprises a first locking rod and a first elastic member, the first installation rod is configured with first sliding-fit holes, an axial direction of the first sliding-fit holes is perpendicular to an axial direction of the first insertion hole, the first locking rod is inserted into and in sliding fit with a respective one of the first sliding-fit holes, the first elastic member is sleeved on the first locking rod and disposed in the respective one of the first sliding-fit holes, the first elastic member has a first end fixedly connected to the first locking rod and a second end fixedly connected to an inner side wall of the respective one of the first sliding-fit holes, and when no external force is applied to the first elastic member, an end of the first locking rod abuts against an outer side wall of a respective one of the first pins by an elastic force of the first elastic member.
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