The invention discloses a special-shaped flanged enclosed bearing frame integral molding method and belongs to the technical field of heat structure carbon/carbon composite material manufacture. According to bearing frame structure characteristics of a special shape, a flange and an enclosed cavity and part bearing characteristics, a carbon cloth laminated structure-based stepwise stitching and near net-shaped molding method is used to realize preparation of an integral knitted carbon fiber bearing frame fabric and a liquid high pressure densification technology and a split-type graphite tool application technology are used to realize deformation control and uniform densification of the whole bearing frame. Through process control and parameter optimization, material mechanical properties are improved, final material density is in a range of 1.85-1.95g/cm<3>, tensile strength is in a range of 200-260MPa, compression and bending strength are in a range of 160-200MPa and interlayer shear strength is in a range of 15-20MPa. The special-shaped flanged enclosed bearing frame integral molding method guarantees high material mechanical properties, realizes whole near net-shaped molding of the special-shaped flanged enclosed bearing frame and greatly improves part bearing efficiency.