A method and apparatus for evaluating residual fracture width of fractures with proppant incomplete filling crack.Firstly, the proppant stiffness model and the initial slit width at different positions along the length direction of the fracturing fluid pressure unloading front are obtained. according to the initial slit width, the proppant stiffness model, and the crack stress, the residual residual width model of the proppant incompletely filled crack is established. Finally, according to the proppant incompletely filling the crack residual slit width model, the residual slit width of the incompletely filled crack of the proppant along different lengths of the crack is obtained. The method can accurately obtain the residual slit width of the incompletely filled crack of the proppant alongdifferent lengths of the crack, which is of great value to the hydraulic fracturing sand design, fracture conductivity analysis and capacity prediction.