The invention provides a tail dustproof suite. The tail dustproof suite comprises a dustproof cover, a dustproof bottom plate and a dustproof sheath, wherein the dustproof bottom plate is in bucklingconnection with the dustproof cover; a cavity formed after buckling is used for placing the tail of a plug housing for sealing; the front end of the dustproof sheath is detachably connected with the dustproof cover and the dustproof bottom plate; the dustproof sheath is provided with a channel for a cable connected with a first contact element in a plug to pass through; and the tail of the dustproof sheath is arranged on a spiral sleeve structure for winding the cable for sealing when the cable passes through the channel. The tail of the plug is subjected to dustproof sealing by the tail dustproof suite, and full sealing of an inter-plate connector in an unused state and a used state is achieved by matching with a sealing structure of a butt joint end of an existing contact element, so that the inter-plate connector has an excellent sealing and dustproof function.