The invention discloses an arm-type crane with a novel winding drum. The winding drum comprises a winding drum body and a winding drum shaft; the winding drum body is provided with a first end plate, a second end plate and a supporting plate, the first end plate is connected with a low-speed shaft of a speed reducer through a winding drum connection structure, the second end plate and the supporting plate fixedly support the winding drum shaft, the winding drum shaft is installed on a winding drum support structure, a steel rope guide groove is formed in the winding drum body so as to enable a steel rope to be guided in and guided out along the steel rope guide groove. Accordingly, the property of the arm-type crane product can be improved.