Spraying device used for building decoration

The invention belongs to the technical field of appliances of applying plastifying substances to the surface of a building under action of gas pressure in the building decoration project, and particularly relates to a spraying device used for building decoration. The spraying device comprises a bracket, wherein a spray head and an air compression mechanism are connected on the bracket; a first cover body which covers the spray head is connected on the bracket; one end, away from the bracket, of the first cover body is connected to a ring-shaped heat conduction tube; a vortex tube is connectedon the bracket; a gas inlet of the vortex tube communicates with the air compression mechanism; a hot end gas outlet of the vortex tube communicates with a gas inlet end of the heat conduction tube; and a gas outlet end of the heat conduction tube and a cold end gas outlet of the vortex tube communicate with the spray head. According to the scheme adopted by the invention, the spraying device solves the problem that dryin