This invention discloses a two-stage effort-saving slingshot and its launching method, belonging to the field of compound bow technology. It solves the problems of existing slingshots, such as arduous charging, complex structure, easy performance degradation, and non-standard launching methods. The slingshot includes a bow body and left and right bow wheel assemblies symmetrically arranged on both sides of the bow body. Each bow wheel
assembly includes a bow wheel and a
ball screw coaxially fixed to it. A large-
diameter helical groove at the end of the bow wheel's threaded groove achieves the first stage of effort saving, while the nominal
diameter of the
ball screw is smaller than that of the bow wheel, achieving the second stage of effort saving. It also includes a synchronous linkage mechanism, guide pulleys, and a protective cover to ensure launching stability. The launching method includes six standardized steps:
projectile placement, gripping and fixing, two-stage effort-saving bow pulling and charging, synchronous calibration,
projectile launching, and resetting. This invention offers significant two-stage effort saving, a simple structure, low cost, high launching stability and accuracy, and a standardized launching method that is suitable for outdoor
recreation, competitive training, and other scenarios. The slingshot's core performance remains stable over a long period, resulting in a long service life.