The embodiment of the invention provides a method for determining contribution rates of different-scale flowback fluids of fractures of a shale gas fracturing well and equipment. The method comprisesthe following steps: establishing a water-gas two-phase flow equation of a hydraulic main fracture, a water-gas two-phase flow equation of a secondary fracture, a water-gas two-phase flow equation ofa natural fracture and a water-gas two-phase flow equation of a matrix; setting initial condition equations, boundary condition equations and auxiliary equations of a hydraulic main fracture, a secondary fracture, a natural fracture and a matrix, and flow-back fluid amount equations of the whole well, the hydraulic main fracture, the secondary fracture and the natural fracture; solving then according to an equation to obtain flowback parameters; finally, according to the whole-well flowback parameters, namely the hydrodynamic main fracture flowback parameters, the secondary fracture flowback parameters and the flowback parameters of the natural fractures, determining the contribution rate of the hydraulic main fracture flow-back fluid, the contribution rate of the secondary fracture flow-back fluid and the contribution rate of the natural fracture flow-back fluid. The influence of the fracture flow-back fluids of different scales on the whole well flow-back fluid amount can be accurately reflected, and an important reference basis can be provided for actual fracturing construction.