The invention discloses a labor saving device. According to the main structure, the labor saving device comprises at least one force storage device, a swinging rod body arranged on the force storage device in a pivotal manner, an impact part movably arranged on one side of the swinging rod body so as to impact on the swinging rod body, at least one elastic construction part connected to one side of the swinging rod body, at least one reset assembly connected to one side of the impact part and at least one rebound assembly arranged at at least one end of the impact part and used for strengthening the impact force of the impact part. Through the adoption of the structure, when a user applies one-off external force to the force storage device, the swinging rod body can be driven to swing; andafter the user relieves the external force, the impact part can repeatedly impact on the swinging rod body through pulling force of the elastic contraction part, force strengthening of the rebound assembly and pulling force of the reset assembly, and then the labor saving aim of achieving multiple functions through one-time force application is achieved.