To provide a peeling device for a protective sheet of wallpaper with paste, which enhances working efficiency at a worksite in installing wallpaper using the wallpaper with paste.

The peeling device for a protective sheet of wallpaper with paste is a device for automatically peeling and winding the protective sheet of wallpaper with paste, which is provided with the protective sheet, and comprises: a supporting shaft of the wallpaper; a feeding roller in the working side; a feeding roller in the peeling side of the protective sheet, which rotates in cooperation with the feeding roller in the working side and a gear; a weight roller having a bearing structure that allows the roller to freely move up and down; and a winding drum of the protective sheet having the weight roller arranged at an inner core side.