A server chassis includes a main frame, a fan module, and a flow-guiding device. The fan module and the flow-guiding device are in the main frame. The flow-guiding device includes a plurality of plate bodies. The plate bodies are parallel to each other and are spaced apart from each other by a spacing. Each of the plate bodies has a plurality of openings. The plurality of openings of one of the plate bodies are arranged alternately with those of another plate body adjacent to the one of the plate bodies.