An exemplary washing mechanism (9) for optical members includes a positioning assembly (10), a carrying assembly (20), and an adjusting assembly (30). The carrying assembly is mounted on the positioning assembly and includes poles (22) and slidable members. The slidable members are configured for holding optical members. Each slidable member is slidably mounted on a corresponding pole. The adjusting assembly is mounted on the positioning assembly and the carrying assembly and configured for adjusting a position of the carrying assembly.