The present invention discloses an integral molding technique and molding system for a supersized composite material member. the integral molding technique includes five steps of vacuum bottling pretreatment, automatically mixing glue, vacuum defoamation, pressure regulating buffering and vacuum bottling, the corresponding molding system includes a automatic glue-mixing system, a debubbling pressure regulating buffering system and a vacuum bottling system. The debubbling pressure regulating buffering system includes a vacuum defoamation system, a pressure regulating pump and a buffering container, the automatic glue-mixing system and the vacuum bottling system are communicated with the buffering container through conveying tubes respectively, the vacuum defoamation system and the pressureregulating pump are communicated with the buffering container through air ducts respectively, each conveying tube and air duct are all provided with valves separately; the mixing glue solution after automatically mixing glue is injected to the buffering container and then is injected to a mould for the integral molding with dual pressures of a positive pressure and a vacuum negative pressure in the buffering container. The molding technique of the invention has advantages of raw material saving, high efficiency, strong serviceability, good product effect, safety, environment protection, etc.