Abstract: A structure of knockdown cabinet includes a plurality of connectors and a plurality of partition plates that is coupled to the connectors to form the knockdown cabinet. The connectors each have at least two side faces forming coupling ribs, and coupling ribs are selectively fit into and connectable to coupling slots formed in the partition plates to allows a user to joint the partition plates with the connectors for forming a variable configuration of knockdown cabinet, which allows of reduction and expansion as desired. The partition plates can be of different sizes, so that the partition plates can form storage compartments of different volumes to enhance variability of the cabinet.