The invention discloses an enclosed dust collector of a rewinder for papermaking, characterized in that the rewinder is enclosed in a confined space by an enclosed chamber structure, an air supply system formed by a first fan, a blowing duct and a blowing opening is arranged above the operating side of the rewinder, and simultaneously, an exhausting system formed by a second fan, a suction duct and a suction opening is arranged below the drive side of the rewinder, thereof, floating dust is collected outdoors for centralized treatment finally under the combined actions of a positive pressure air curtain at the upper part and negative pressure suction at the lower part. Proven by tests, by using the enclosed dust collector of a rewinder, the dust content is less than 5mg/m<3>, and the dustcollecting efficiency is quite higher than that of an open dust collecting scheme which is in general use at home and abroad currently, so that the enclosed dust collector has good effects on improving the occupational safety of operating personnel and improving the product quality.