Curvature-adjustable plastering tool

The utility model discloses a curvature-adjustable plastering tool. The curvature-adjustable plastering tool comprises an arc-shaped plastering plate which can be elastically deformed and has toughness; the two metal strips are correspondingly fixed to the two sides of the same side of the back of the arc-shaped plastering plate, and the front side face of the arc-shaped plastering plate is a protruding arc; the nut is fixed to the middle of the back of the arc-shaped plastering plate, and a bolt is screwed to the nut in an interference mode and penetrates through the nut to extend downwards. The metal strips on the same side of the back of the arc-shaped plastering plate are fixed to the lower portions of the bolts through adjusting lines. The bolt rotates on the nut to retract or release the adjusting line, so that the adjusting line can pull the metal strips on the two sides of the same side of the back of the arc-shaped plastering plate at any length, and any gradient curvature is obtained for the arc-sha