The invention discloses a printing method for a shell object of a 3D model. The method is used for printing the shell object of the 3D model with a plurality of printing layers. The method comprises the steps that firstly, all candidate points of a first layer of the shell object are obtained, one of the candidate points is selected to serve as a starting point of the first layer according to a preset rule, and the first layer starts to be printed from the starting point; and then, all candidate points of a next layer of the shell object are obtained, a candidate point closest to the startingpoint of the previous layer serves as a starting point of the current printing layer, and the current printing layer starts to be printed from the starting point. According to the method, the candidate point closest to the starting point of the previous layer fixedly serves as the starting point of the current printing layer through calculation, so that all the starting points of all the corresponding printing layers are relatively continuous, and therefore the printed shell object can be more attractive.