The invention discloses a lens trimming and fine grinding machine. The lens trimming and fine grinding machine comprises a body shell, a motor shell located on one side of the body shell and a base located at the bottom of the body shell. A grinding wheel is mounted in the body shell. A motor is mounted in the motor shell, and the output end of the motor is connected with the grinding wheel. Through an arranged water outlet valve, the water outlet valves are rotationally adjusted, a silica gel hose communicates into different through holes, and therefore cooling is achieved in different lens grinding stages, the aim of targeted water utilization is achieved, meanwhile, an adjusting water valve can control the water outlet quantity, and the effects of grinding, cleaning and cooling are achieved; through the arrangement of a micro water suction pump and a filter screen, the water suction pump pumps used water flow in a water collection box into a water storage box, water circulation is achieved, and therefore repeated utilization is achieved, water is saved, meanwhile, the filter screen filters out powdered scraps generated during grinding, and the powdered scraps are deposited in the water collection box; and periodic treatment is achieved, design is flexible, and the machine is convenient and practical to use.