The invention relates to a self-spraying type paint roller brush. The interior of a brush handle is connected to a pump body through a water inlet pipe, the water inlet pipe extends all the way to a paint bucket, and a centrifugal impeller is installed in the pump body. The centrifugal impeller conveys paint upwards in the rotating process, the working space of the pump body can be filled with the paint, the centrifugal impeller further conveys the paint into the pump body, and finally, the pump body pushes the paint onto bristles of the paint roller brush through the water inlet pipe.