The invention discloses a sheet unreeling device capable of preventing loosening. The sheet unreeling device capable of preventing loosening comprises a first fixed support and an unreeling rotating shaft, wherein the unreeling rotating shaft is horizontally arranged on the first fixed support; a second support is arranged at one side of the first fixed support; the second support is provided with a first bending plate rocker arm and a second bending plate rocker arm in a hinging way; the tail end of the first bending plate rocker arm stretches to a position above the unreeling rotating shaft and is provided with a pressing roller parallel to the unreeling rotating shaft; the tail end of the second bending plate rocker arm stretches to a position under the unreeling rotating shaft and is provided with a supporting roller parallel to the unreeling rotating shaft. Through the way, according to the sheet unreeling device capable of preventing loosening disclosed by the invention, pressure is applied to the surface of a coiled material of a sheet by utilizing the pressing roller, the sheet is enabled to fit the surface of the coiled material by rotating the pressing roller before being unreeled, and the problem of sudden loosening is avoided; the supporting roller can be used for guiding the unreeled sheet, and deviation during unreeling of the sheet is avoided by guiding rollers arranged at two sides, so that unreeling and conveying stability is increased.