The present invention relates to a drawer-type washing machine and a locking method thereof. The washing machine comprises: a housing having one open side and partitioned into a plurality of compartments; cabinets which can be drawn out forward through the open side of said housing, each of said cabinets being positioned in each of said compartments; washing baths for washing the laundry, each of said washing baths being positioned within each of said cabinets; and locking means provided between said housing and said cabinets for restraining said cabinet from being drawn out forward from said housing, in which the cabinets are automatically drawn out by only operating a switch installed in an outside wall of the housing. It is prevented that the washing machine falls down as all of the cabinets are drawn out biasing the center of gravity forward.