Disclosed herein is an aerosol generating and mixing system operating at a high temperature and a high pressure which includes an aerosol generating device; and an aerosol mixing device, wherein the aerosol generating device includes a pre-mixing tank and a mixing tank, and the mixing tank and the pre-mixing tank include a wing configured to rotate about a central shaft of the tank so as to agitate an inside aerosol, and an agitating motor configured to rotate the wing, and a filling nozzle of the mixing tank and the pre-mixing tank is configured to inject any of an aerosol aqueous solution and an aerosol particle.

Disclosed are a paddle discarding fully-sealed cement stirring and solidification bucket and a liquid injection and stirring method. A stirring paddle, a bucket cover, and a stirring steel bucket are first assembled and conveyed to a feeding station for cover removal and cement filling; then the stirring steel bucket is conveyed to a stirring station; after a stirring power device, a waste liquid injection device, and a breathing and exhaust device are correspondingly connected to a stirring paddle drive connection end, a waste liquid injection interface, and a breathing and exhaust device interface, injection and stirring of radioactive waste liquid are carried out in a fully-sealed environment. In the present invention, the stirring paddle is discarded in the steel bucket, thereby avoiding the problems of secondary radioactive waste liquid produced by cleaning the stirring paddle and diffusion of radioactive aerosol in the stirring process.