The invention discloses a rice milling precision adjusting device. The rice milling precision adjusting device comprises a first motor, a rotary shaft, a limiting switch, a pressing plate, an elasticcomponent, a stop dog and a fixed plate. A rice mill comprises the rice milling precision adjusting device, an operation panel used for selecting the rice milling precision, a second motor, a rice milling module, a feed port, a discharge port and a bran discharge port. The angle of the pressing plate and the discharge port of the rice mill is adjusted through deformation of the pressing plate so as to change the size of the discharge port of the rice mill, and then the duration of unhusked rice staying in the rice milling module is controlled. The rice milling precision can be adjusted. The accuracy can be effectively improved through the adjustment method. The cost can be lowered.