The invention discloses a floor waterproof paint coating machine for building engineering construction. The floor waterproof paint coating machine for building engineering construction comprises a boxbody, a storage chamber, a stirring shaft, a moving wheel, a stirring blade, a handle, a sealing cover, a stirring motor, an air compressor, a swinging mechanism, a connection square shaft, a vertical hole, a rotating head, a transmission shaft and a screw; and the floor waterproof paint coating machine for the building engineering construction is reasonable in structure, low in production cost,convenient to install and complete in functions, and the stirring motor can drive the stirring shaft and the stirring blade to rotate, paint is uniformly stirred, and the effect of the use of the paint is improved; an adjustment head is rotated by an internal hexagon wrench, so that a fixed shaft is located at different positions in a long groove to drive a swinging arm to swing, and the amplitudeof swinging of a coating device is adjusted. The coating device can loosen a fixed bolt to adjust the telescopic distance of a movable shell, the area of the swing coating is further adjusted, and the use effect is further improved.