A method for movably filling powder into a container comprises eight steps, such as placing a tank car, paving lining bags in the container, and connecting a movable powder filling device with the tank car and the container, wherein the movable powder filling device comprises an air compressor, a dryer, a buffering tank, the tank car, a dust remover, the container, a lifting platform and a moving platform which are sequentially connected. With the adoption of the method, the current problems of complex links in powder packing and containerization shipment processes, large waste and high energy consumption can be solved; with the adoption of the movable powder filling device, the powder can be transferred based on the unit of the container, so that a large amount of outer packages can be saved, the transferring times can be greatly decreased, and as a result, the labor and material consumption can be reduced; and the product is loaded and transported in a large package form through the container, so that the product quality is uniform, the secondary pollution caused by transferring can be effectively resisted, and the convenience is provided for an enterprise and downstream users.