The invention belongs to the technical field of constructional engineering tools, and particularly relates to a coating brushing roller for constructional engineering, which comprises a roller body, arotary connecting part, a driving module, an annular sleeve, a motor, stirring modules and a liquid discharging module, the outer side of the roller body is sleeved with a soft bristle sleeve; one end of the roller body is fixedly connected with an annular sleeve; one end, deviating from the roller body, of each annular sleeve is provided with a rotary connecting part; a driving module is installed at the position, located on the inner side of the annular sleeve, of one end of the roller body, a first rotating connecting rod and a second rotating connecting rod are installed in the roller body, two stirring modules are installed on the first rotating connecting rod and the second rotating connecting rod correspondingly, and a sliding partition plate is arranged in the roller body. Coatingis pressurized and guided into the interior of the liquid drainage module through the two sliding partition plates, then the coating is quantitatively sprayed out through the two corrugated pipes, the coating is evenly distributed on the soft bristle sleeve, the two ends of the soft bristle sleeve are replaced with supplementary materials, and the painting efficiency and quality are effectively improved.