The invention discloses a self-inhalation paint stirring device for building. The device comprises a mixing barrel, a hollow stirring shaft, a motor, a first gear, a second gear, a funnel-shaped cover, a liquid inlet hole, a flow deflector, a mounting shaft, a stirring rod, a sector plate and a circular box body. With the arrangement of the hollow stirring shaft, the funnel-shaped cover, a disc and screw blades, the air can automatically inhaled, thus realizing high-efficiency gas-liquid mixing; by continuously blowing air into the mixing barrel and continuously turning over a paint, the stirring and mixing efficiency is improved, deposition and clogging of the paint in a discharge pipe can be effectively prevented, and discharging is also convenient; and with the arrangement of the mounting shaft, the sector plate and the circular box body, the paint will enter through a through hole at one side of the circular box body and then is discharged through a through hole at the other side during the rotating process, and then the paint continuously pushes the sector plate during the motion process, the sector plate drives the mounting shaft to rotate around its own axis, and finally thestirring rod is driven to rotate. Through the revolution and rotation, mixing is more uniform, and the stirring efficiency is further improved.