Locking device, mechanical lock and washing machine

The utility model relates to a locking device, a mechanical lock and a washing machine, and the locking device comprises a sliding part, a base, a first elastic part and an elastic locking assembly, the sliding piece is slidably connected with the base through the first elastic piece and can slide in the first direction and/or the second direction relative to the base. The sliding piece is provided with a driving sliding groove, the driving sliding groove is provided with a buckling wall, the first end of the elastic locking assembly is connected with the base, the second end of the elastic locking assembly abuts against the bottom of the driving sliding groove in a sliding mode, and the second end of the elastic locking assembly movably abuts against the buckling wall. According to the locking device, the locking and unlocking processes of the locking device can be completed only by applying external force opposite to the first direction to the sliding piece to control the movement ofthe sliding piece, the s