The invention relates to a reciprocating saw which comprises a shell, a motor, a main shaft, a reciprocating rod, a lifter, a lifter position regulating mechanism, fixing parts and actuating parts, wherein the shell extends in the longitudinal direction; the motor is arranged in the shell; the main shaft is perpendicular to the longitudinal direction and is driven by the motor; the reciprocating rod is in eccentric connection with the main shaft and makes reciprocating movement in the longitudinal direction through the rotation of the main shaft; the lifter plays a lifting role on the reciprocating rod in the direction perpendicular to the longitudinal direction; the lifter position regulating mechanism is used for regulating the position of the lifter; and the fixing parts are connected to the reciprocating rod; and the actuating parts are in fit connection with the fixing parts. When the actuating parts slide to different positions in the longitudinal direction, the fixing parts drive the reciprocating rod to the corresponding heights in the direction perpendicular to the longitudinal direction. The adopted design enables the whole lifter position regulating mechanism to have simple structure and convenient use; in addition, as positioned on the top of the shell, the lifter position regulating mechanism needs only a small space.