The present invention provides a production method for control of composite material vacuum auxiliary moulding thickness, according to the method, resin is filled the entire cavity, and when the resin reaches the exhaust tube position, the resin injection is continued for effective control of the thickness of a composite part. By determining the continued resin injection time, each batch molding thickness uniformity can be ensured, and normal implement of composite VARI molding process is not affected. According to the method, in the case of no change of composite part VARI molding process equipment, the purpose of control of the thickness of the composite part can be achieved only by the resin injection time in the VARI molding process, and the problems that the thickness of the composite part in the VARI molding process is difficult to control and unstable can be effectively solved. The method is suitable for industrialized production, and has great application value.