The invention provides a 3D seal, a manufacturing method thereof, a 3D seal pattern forming method and a target object with a 3D seal pattern. The 3D seal comprises a 3D information printing unit, andis used for enabling the object surface to form the seal pattern corresponding to the 3D information of the designated area of a human body. According to the scheme, the local three-dimensional information of the human body is used as the seal content, so that a viewer cannot recognize the privacy information from the seal pattern, and for example, the human face outline cannot be obtained through observation of the seal pattern, and the privacy can be protected. Meanwhile, the three-dimensional information of the human body can be compared with the two-dimensional outline, so that the information content of the seal can be improved, and the imitation difficulty is improved.