The invention discloses a wood plastic inward opening sash. The wood plastic inward opening sash is provided with an inward opening sash body, the cross section of the inward opening sash body is an inverted-Z-shaped frame, the upper end of the inverted-Z-shaped frame is divided into a plurality of frames by rib strips, a C-shaped clamping groove A is formed in the angle part of the lower end of the frame on one side, a clamping hook A is arranged on the outer side wall of the frame on the other side, a large rectangular frame is arranged on the middle part of the inverted-Z-shaped frame, anda clamping hook B is arranged on the frame side of the side, close to the C-shaped clamping groove A, of the large rectangular frame; a C-shaped clamping groove B is formed in the upper end of the frame side of the other side, close to the C-shaped clamping groove A, of the large rectangular frame; an inward groove is formed in the lower end of the C-shaped clamping groove B; clamping plates are arranged at the upper end and the lower end of the groove; the lower end of the inverted-Z-shaped frame is divided into a plurality of frames by rib strips; and a C-shaped clamping groove C is formed in the outer side of the frame on one side, and a C-shaped clamping groove D is formed in the angle part of the upper end of the outer side of the rectangular frame. The wood plastic inward opening sash is firm in structure, good in sealing and convenient to install, and has good economic and promotional value.