The invention relates to a device for folding a scooter and belongs to the field of mechanical engineering. In order to overcome the defect that an existing scooter is inconvenient to carry, the invention discloses a folding device of a scooter. The technical scheme for realizing the invention is that a double-connecting-rod mechanism is used as a main working part of folding; a ratchet-pawl mechanism is used as a locking part, and the folding of a skateboard is realized by means of external force pressing. A household meat chopping device disclosed by the invention has the following advantages that (1) the reliability and convenience of the working process are guaranteed by using the double-connecting-rod mechanism as the main working part of folding; (2) the folded and unfolded skateboard are enabled to be in a locked state by using the ratchet-pawl mechanism to guarantee the adjustability and safety of working; and (3) the structure is simple, the detaching is convenient, and the checking and maintenance are convenient.