The invention relates to a shale gas development evaluation method and device and a terminal device, and relates to the technical field of shale gas development. The shale gas development evaluation method includes: for each target area of shale gas development, standardizing various parameters affecting the shale gas development of the target area according to a preset rule to obtain various standard parameters; For each standard parameter of each target area, calculating the first weight coefficient of each standard parameter by an analytic hierarchy process, and calculating the second weight coefficient of each standard parameter by a mean square error method; according to the first weight coefficient and the second weight coefficient, calculating a standard weight coefficient of the corresponding standard parameter; for each target area, calculating the developability of the target area shale gas according to various standard parameters of the target area and corresponding standardweight coefficients. Through the above method, the developability of the shale gas development area can be accurately and effectively evaluated.