The invention aims to design a rotary vibration screen flange welding tool with reasonable structure and good use effect. The rotary vibration screen flange welding tool comprises a frame; a tabletop is arranged on the frame, and is provided with a positioning screw rod; a positioning screw sleeve is assembled on the positioning screw rod; a positioning disc is fixed out of the positioning screw sleeve; machining screw rods are symmetrically arranged on two sides of the positioning screw rod, and are respectively assembled with screw sleeves; and pressing plates and handles are respectively fixed on the screw sleeves. The rotary vibration screen flange welding tool has the beneficial effects of capability of quickly positioning and fixing flange plates and convenience for high-efficiency machining of the flange plates.