The invention relates to the field of petroleum pipelines, in particular to a petroleum pipeline leaking stoppage device. The device comprises a mounting frame. A threaded regulating base is arrangedon the right side of the mounting frame. A threaded regulating rod is in threaded connection with the threaded regulating base. A leaking stoppage base is mounted at the left end of the threaded regulating rod. A regulating wheel is arranged at the right end of the threaded regulating rod. A first cavity is formed in the middle of the leaking stoppage base. A first piston plate is arranged in thefirst cavity. An annular second cavity is formed in the outer side of the first cavity. A plurality of first ventilating holes are formed between the second cavity and the first cavity. A limit plateis mounted in the middle of the second cavity. Second ventilating holes are formed in the limit plate. A second piston plate is arranged on the outer side of the limit plate. A supporting column is arranged on the outer side of the second piston plate. An annular leaking stoppage plate is arranged at the outer end of the supporting column. A leaking stoppage pad is arranged on the outer side of the annular leaking stoppage plate. Due to the structural arrangement of the device, the leaking stoppage effect is greatly improved by means of pressure of petroleum, and the practicability is high.