The utility model discloses a fiber feeding device which comprises a filling-in part which is used for being filled with fiber and a conveying fan which is provided with an input opening and an output opening, wherein the filling-in part comprises an inner cavity and a filling-in opening which is communicated with the inner cavity; the conveying fan comprises a shell, a first motor and impellers which can be driven by the first motor. The impellers are located in the shell, the input opening and the output opening are formed in the shell, the input opening is communicated with the inner cavity, and the output opening is connected with a first pipeline which can be communicated with a mixing tank. The fiber feeding device can reduce the generation of fiber dust in the process of adding the fiber into fracturing fluid.