A nail machine having an effort-saving mechanism is provided, including: a shell body; an operating mechanism, disposed on the shell body and having a pressing rod, a driving rod and a connecting rod, the connecting rod respectively connecting with the pressing rod and the driving rod, the operating mechanism for operating to move between a first position and a second position; a restricting member, two ends of the restricting member respectively formed with a sliding portion and an engaging portion; a striking plate force applying mechanism, including a striking plate and a force applying member, the striking plate movable between an initial position and a releasing position; wherein when the operating mechanism moves toward to the second position, the engaging portion engages the striking plate and the striking plate moves toward to the releasing position; when the operating mechanism is located at the second position, the engaging portion departs from the striking plate and the striking plate moves toward to the initial position.