The utility model relates to a membrane dryer with a blowing and sweeping air distribution structure, comprising polymer hollow fiber membrane filaments, a shell, blowing and sweeping airflow distributor, encapsulating glue and a valve. The upper end surface and the lower end surface of the shell are provided with a wet air inlet and a dry air outlet respectively and the side wall is provided with a blowing and sweeping air inlet and a blowing and sweeping outlet; the blowing and sweeping airflow distributor is arranged in the shell and comprises air guiding pipes, blowing and sweeping pipes, an upper bracket and a lower bracket; the air guiding pipes are distributed uniformly in the plane of the upper bracket; one end of one of the air guiding pipes penetrates through a groove of the upper bracket so as to be connected with the blowing and sweeping air inlet; one ends of other air guiding pipes are sealed and fixedly connected with the inner edge of the upper bracket; the blowing and sweeping pipes are arranged between the upper bracket and the lower bracket which are parallel; the polymer hollow fiber membrane filaments are arrayed vertically in the shell, the upper ends and the lower ends of the polymer hollow fiber membrane filaments are fixed between two convex structures by the encapsulating glue, and the openings of two ends of the polymer hollow fiber membrane filaments are communicated with the dry air outlet and the wet air inlet. The drying performance of the membrane dryer is improved effectively, and blowing and sweeping airflow is controlled easily. The membrane dryer is convenient to operate.