The invention provides a chamber side plate, a rotating device, a rotation system and fluid machinery using the chamber side plate, the rotating device and the rotation system. The chamber side plateis of an annular structure and comprises a heat exchange passage which at least comprises two openings, including an inner opening and a side opening, wherein the inner opening is toward the inner side of the annular structure, and the side opening is formed in the side surface of the chamber side plate. In the chamber side plate provided by the invention, the heat exchange passage can realize heat exchange of a working substance positioned inside an inner leakage chamber and a working substance positioned in a working chamber, can reduce the temperature of the working substances, prevents cavitation caused by vaporization of the working substances, can simultaneously make the chamber side plate and relevant components positioned on a rotor component work within a reasonable temperature range, prevents high-temperature burning, prolongs the service life of the chamber side plate, improves the work reliability of the fluid machinery and achieves relatively good popularization and application values.