Construction paint spraying tool

The utility model relates to the technical field of paint spraying tools, in particular to a construction paint spraying tool which comprises a paint spraying tool body, and a conical storage bin is arranged at the upper end of the paint spraying tool body. The guide roller is rotationally arranged in the paint spraying tool body, the hydraulic cylinder drives the mounting frame to move forwards, so that the brush head is inserted into the inner side of the steel pipe, at the moment, the sealing baffle plate is attached to one end of the steel pipe, the air pump is started to inflate the inner side of the hollow pipe, the air acts on the air baffle plate, and the brush head is pushed to move on the inner side of the steel pipe; paint in a paint box is fed into a transfer box through a paint pump, the transfer box sprays out from spraying holes in the two sides of a brush head through a hose, then the paint is evenly smeared through the brush head, then the hose is recycled through a winding roller, an inserti