Coating film peeling method and coating film peeling device

The present invention provides a coating film peeling method and a coating film peeling device with which it is possible to efficiently and reliably peel a coating film from a base film having a coating film, using a washing solution. A method for peeling a coating film from a base film having a coating film according to the present invention is for peeling a coating film from a base film having a coating film which has a coating film containing a water-soluble resin, and is characterized in that a washing solution is applied in a range of 3-650 mL/m2 to the surface of the coating film, then, while bringing a peeling member into direct contact with the coating film surface of the base film having a coating film and while making the angle formed by the base film via the peeling member be in the range of 20-150 DEG and applying tension in the range of 10-1000 N/m in at least one longitudinal direction of the base film, moving the base film in the longitudinal direction of the base film relative to the peeling m