The embodiment of the invention discloses an expression image generating method, device and a storage medium. The method comprises the following steps: a selected user image is acquired, and a face image in the user image is acquired; three-dimensional reconstruction processing is carried out on the face image to acquire a three-dimensional face model corresponding to the face image; expression parameters are acquired in an expression parameter set, and the expression parameters and the three-dimensional face model are subjected to synthesis processing to generate a first expression image corresponding to the face image; and the first expression image is subjected to image filling processing to acquire a target expression image corresponding to the user image, the target expression image is added to an expression image sequence corresponding to the user image, and the expression image sequence is outputted. Thus, the expression image which meets requirements of the user can be acquired, the operation process is simple and quick, and convenience for expression image acquisition is thus enhanced.