The invention discloses an automatic hammer type printer. The automatic hammer type printer comprises a printing table fixedly arranged on the ground. A printing cavity intercommunicating left and right is fixedly formed in the printing table, and the left and right end walls of the printing cavity communicate with the outer space. Paper feeding cavities which are symmetrically arranged front andback and provided with upward openings are formed in the front and back end walls of the printing cavity in a communicating mode, a rotary motor is fixedly arranged in the front end wall of the frontpaper feeding cavity, and an output shaft of the rotary motor penetrates through the printing cavity and the back paper feeding cavity and is rotatably connected with the back end wall of the back paper feeding cavity in a matched mode. The automatic hammer type printer is simple in structure and convenient to use, prints contents of painting through different colors of pens, can erase places needto be modified by an eraser, a draftsman can modify, revise and alter according to the printed visual contents by the paper to try to come up with more satisfying painting contents, the printed papercan be recycled, and the cost is reduced.