Type K Pneumatic Pressure-loading Slide Gate System is a frame structured right-and-left opening mechanism consisting of upper framework, sliding framework, lower framework, inner and outer nozzle seat, etc. With a pneumatic pressure-loading device, optimal face pressure distribution between slide plates can be guaranteed and higher pressure value can be reached, shielding slide plates from being affected by high temperature and human factors, maximizing their service life, and reducing accident risk brought by pressure loss of springs at high temperature.