The invention discloses a jaw crusher. The jaw crusher comprises a rack, a fixed jaw plate, a movable jaw plate, an adjusting device used for adjusting a bottom clearance of the movable jaw plate, and a driving mechanism used for driving the movable jaw plate to perform periodic reciprocating motion, wherein the fixed jaw plate and the adjusting device are mounted on the rack; the bottom of the movable jaw plate is connected with the adjusting device; the top of the movable jaw plate is connected with the driving mechanism; a crushing cavity is formed between the movable jaw plate and the fixed jaw plate; a plurality of first cold water channels are arranged on the side wall of the fixed jaw plate; a plurality of second cold water channels are arranged on the side wall of the movable jaw plate; a plurality of first fins are arranged on the sides, close to the fixed jaw plate, inside the first cold water channels; a plurality of second fins are arranged on the sides, close to the movable jaw plate, inside the second cold water channels; lining plates are movably connected on the relative surfaces of the movable jaw plate and the fixed jaw plates; a plurality of reverse teeth are arranged on the relative surfaces of the two lining plates; and the reverse teeth on the two lining plates are distributed in a staggered manner. According to the jaw crusher, the temperature of the movable jaw plate and the fixed jaw plate can be effectively decreased, and the service life is greatly prolonged.