Pressing die and method for forming resin matrix composite special-shaped piece

The invention discloses a pressing die and method for forming a resin matrix composite special-shaped piece. The pressing die comprises a female die arranged on a female die fixing plate and a male die assembly arranged on a male die fixing plate. The male die assembly comprises a forming male die and a pressing assembly. The forming male die comprises a first male die and a second male die. The pressing assembly comprises a first pressing block and two second pressing blocks symmetrically arranged on the two sides of the second male die. The male die assembly and a prepreg pavement piece jointly form a combined male die structure matched with a rectangular die cavity. The pressing method comprises the first step of prepreg tailoring, the second step of prepreg pavement layer die filling,the third step of die assembling pressing and the fourth step of die sinking demoulding. The formed special-shaped piece has the advantages of being low in inner stress, small in warping deformation and stable in mechanical p