The invention discloses a connecting mechanism of a dildo. One end of a driving mechanism connecting end is connected to one end of a connecting mechanism body, and the other end of driving mechanism connecting end is provided with a driving mechanism connecting member. One end of a dildo connecting end is provided with a dildo connecting member, and the other end of the dildo connecting end is connected to the other end of the connecting mechanism body. The other end of the dildo connecting end is provided with a connecting column, the inside of the other end of the connecting mechanism body is provided with an internal connecting cavity matched with the connecting column, and the connecting column is inserted into the internal connecting cavity. A concave limiting groove is formed in the connecting column circumferentially, a limiting member embedding groove communicated with the internal connecting cavity is formed in an outer wall of the connecting mechanism body, and a limiting member is embedded in the limiting member embedding groove. An outer sleeve is sleeved over the outside of the connecting mechanism body, a protrusion I is arranged at an inner wall of the outer sleeve, and when the protrusion I corresponds to the limiting member embedding groove in position, the protrusion I exerts a pressure on the limiting member. The invention helps to solve the problem of easy separation of a dildo and a driving mechanism.