Waterproof layer coating device for building engineering construction

The utility model discloses a waterproof layer coating device for building engineering construction. The waterproof layer coating device comprises a device bracket and a charging barrel, a charging barrel is installed on the surface of the device support and can be used for containing waterproof layer paint, a driving electric drill is installed between the device support and the charging barrel, an air pump is installed on the surface of the device support, and a spray gun is installed on one side of the charging barrel. According to the waterproof layer coating device for building engineering construction, when a fixing block drives a butt joint hole to move to the top position of an inserting block, a spring strip can drive the inserting block to enter the butt joint hole, and therefore the position of a spray gun can be fixed; when the protection plate rotates to the surface position of the fixed clamping hook, the fixed clamping hook can be extruded to rotate and drive a reset spring to deform, and when