The invention discloses a 3D printing mould device with a rotating function and relates to the technical field of the 3D printing moulds. A rotating shaft is mounted in the middle of a base through abearing seat, and the upper end of the rotating shaft is connected with a supporting plate. Supporting balls are mounted on the two sides of the bottom of the supporting plate correspondingly and makecontact with the upper surface of the base. A first gear is mounted on the rotating shaft and engaged with a second gear which is mounted on a rotating shaft of a driving motor. A heat dissipation fan is mounted on the upper side wall inside the left side of the base, and a heat collecting plate is mounted inside the supporting plate. The lower end of the heat collecting plate is provided with aplurality of heat dissipation pipes which penetrate through the bottom of the supporting plate, a threaded sleeve is arranged in the middle of the supporting plate and internally connected with a positioning column, and a 3D printing model body is arranged on the supporting plate. Rotating and heat dissipation of a model can be effectively realized, quick printing is facilitated, the using efficiency is high, and the time can be saved.