The invention discloses an injection mold with an in-mold shear mechanism. The injection mold comprises a fixed mold cavity, a movable mold cavity and a movable mold frame, wherein a product molding cavity is formed between the fixed mold cavity and the movable mold cavity; a trough is formed between the fixed mold cavity and the movable mold cavity and is horizontally arranged; the inner end of the trough is communicated with the product molding cavity; a to-be-cut part is arranged at the joint of the trough and the product molding cavity; a shear component is arranged below the to-be-cut part and comprises a cutter and a driving component; the driving component is arranged between the fixed mold cavity and the movable mold cavity; the cutter penetrates through the movable mold cavity from bottom to top; the driving component drives the cutter to move up and down; and the end of the cutter is positioned just under the to-be-cut part. The to-be-cut part is arranged at the joint of the trough and the product molding cavity, and the shear component is arranged below the to-be-cut part, so that the to-be-cut part is automatically sheared after a plastic part is subjected to pressure maintaining in the mold. The injection mold has the characteristics that the sheared end face is flat and smooth when the sprue is just frozen and the temperature is extremely high. The injection mold disclosed by the invention belongs to the technical field of mold equipment.