The utility model discloses a rice seed sterilization device. A box cover is detachably arranged at the upper end of a box body, supporting legs and a motor are arranged at the lower end of the box body, an output shaft of the motor is vertically and upwards connected with a stirring shaft, and the stirring shaft is sequentially connected with a plurality of groups of stirring blades from bottom to top; a seed placing device is detachably arranged in the box body, the seed placing device comprises an inner cylinder, an outer cylinder and a bottom net fixedly connected with the inner cylinder and the outer cylinder, and the inner cylinder, the outer cylinder and the bottom net are all made of filter nets; the lower end face of the box cover is fixedly connected with a spring, the lower endof the spring is fixedly connected with an annular upper pressing net, and the upper pressing net is matched with a space formed between the inner cylinder and the outer cylinder; and the plurality ofgroups of stirring blades are positioned in the inner cylinder. According to the utility model, the uniformity degree of the liquid medicine for soaking the rice seeds for a long time can be effectively improved, so that the disinfection and sterilization effects on the rice seeds are improved.