A reinforced puller comprises a lead screw (1), a supporting head (2), a supporting frame (3), a hexagonal member (4), a left disc (5), five reinforcing ribs (6) and a right disc (7). The lead screw (1) of the reinforced puller is provided with a trapezoidal external thread, the front end of the lead screw (1) is of a taper angle of 90 degrees, and two circular through holes C are crossed and formed in the direction perpendicular to the axis of the tail end of the lead screw (1). The lower end of the supporting head (2) is inserted into the supporting frame (3), and a hexagonal through hole A formed at the upper end of the supporting head (2) is matched with the hexagonal member (4). The hexagonal member (4) is connected with the center of the left disc (5), and a trapezoidal internal thread arranged at the center of the hexagonal member (4) is matched with the lead screw (1). Two ends of each of the five reinforcing ribs (6) are connected with the left disc (5) and the right disc (7) respectively. The reinforced puller safe to use is applicable to replacement of motor belt pulleys of oilfield pumping units and capable of avoiding damages to rims of belt pulleys and further avoiding damages to belts in engagement, and thus, belt pulley and belt expenses are saved, time and labor are saved, production efficiency of pumping wells is improved, and crude oil output is increased.