Construction method of building outer wall composite board

The invention provides a construction method of a building outer wall composite board, and belongs to the technical field of building wall heat preservation. The construction method of the building outer wall composite board comprises the following steps that an outer wall base layer is treated and leveled; a grid snapping line is arranged on the surface of the leveled outer wall base layer; a bearing frame is installed on the outer wall base layer by combining the positions of the grid snapping lines; combining the position of the bearing frame, and pasting a composite board on the outer wall base layer; an anchoring part is installed on the composite board; sealant is injected into gaps of the composite board; downward air holes are formed in the middle of a plate seam of the composite plate or at the joint of four plates; exhausting the bonding surface of the composite board at the vent holes by using an exhaust device; a ventilation piece is mounted at the exhaust hole; cleaning the ...