Improved automatic dauber

The utility model belongs to a professional wall painting device, in particular to an improved automatic plastering machine, which comprises an U-shaped supporting bracket vertically arranged, whose downside end is matched and connected with a wheel undercarriage. The side arm of the U-shaped supporting bracket is a bushing structure with a pin hole, and a horizontal beam is slidably connected with the side arm. A plastering head slides horizontally accordingly in the horizontal beam axial direction under the drive of a horizontal driving structure, and through a transmission structure; the plastering head is also communicated with a magma pump; a steel wire of a vertical lifting mechanism is separately connected to a top cross arm of the U-shaped supporting bracket and to a vertical lifting transmission mechanism arranged on the horizontal beam. A locating bar is movably arranged on the upper part of the outer bushing pipes of the right and left side arms of the U-shaped supporting bracket. A locking device is arranged at the bottom of the inner bushing and the two sides of the horizontal beam. The bushing lifts one end of the steel wire to hook connected onto the locating bar, another end is coordinated with a reel set up on the horizontal beam and driven to rotate by a driving mechanism. The utility model solves the problem in that the prior art is complicated in operation, intensive in workloads and low in working efficiency, and has the advantages of high working efficiency and convenient operation.