The invention discloses a roller supporting structure for a mahjong tile cleaning and sterilizing machine with the characteristic of simple structure. The roller supporting structure for the mahjong tile cleaning and sterilizing machine comprises a supporting plate and a bearing which is arranged on the supporting plate, wherein a through hole capable of making a roller transmission shaft pass through is formed on the supporting plate; a blind hole for accommodating the bearing is formed on the supporting plate; and an axis of the blind hole is overlapped with an axis of the through hole and the diameter of the blind hole is greater than that of the through hole. During assembly, only by assembling the bearing into the blind hole and making the roller transmission shaft pass through an inner ring of the bearing and the through hole, the roller for cleaning the mahjong tiles can be assembled on the supporting plate, so that the assembling process is simple. Meanwhile, the distance between two adjacent rollers can be guaranteed. Therefore, the roller supporting structure has the advantages of capacity of guaranteeing the cleaning effect on the mahjong tiles, and suitability for popularization and application in a structure that a plurality of transmission shafts are needed to be assembled on the same plate.