The invention relates to a powder paving device for manufacturing an additional material. The powder paving device comprises a powder paving platform, a powder supply device, a powder distribution device, a first limiting block, a second limiting block and a scraping device, wherein the powder supply device, the powder distribution device, the first limiting block, the second limiting block and the scraping device are arranged on the powder paving platform; the powder distribution device comprises a powder distribution component and an elastic recovery component; the powder distribution component is rotatably arranged relative to the powder paving platform and at least comprises two sub-slot bodies, and the sub-slot bodies are used for respectively receiving powder supplied by the powder supply device and can topple over towards two sides along the rotation of the powder distribution component so as to respectively discharge powder of the different sub-slot bodies to two sides of a scraper device; and the elastic recovery component is used for driving the powder distribution component to return to an initial position when the powder distribution component is not impacted with the first limiting block and the second limiting block. According to the powder paving device, the bi-directional powder paving can be realized, and the formation efficiency is improved.