The utility model discloses an oil-water well underground tubular column flushing device, which is a device for flushing crude oil attached to the surface of an oil-water well underground tubular column at a wellhead of an oil-water well operation site in the petroleum industry, protects the environment and improves the operation efficiency. The underground tubular column flushing device comprisesa slurry umbrella and a leakage-proof pipe, wherein the slurry umbrella is fixed at the lower part of a liquid inlet hole of the leakage-proof pipe; wherein the leakage-proof pipe is connected with the washing pipe through a flange plate and a connecting bolt, the puncture washing opening is formed in a pipe body of the washing pipe, a liquid storage bag is arranged outside the puncture washing opening, a liquid inlet is formed in the outer wall of the liquid storage bag, and a liquid outlet is formed in the pipe body of the washing pipe below the liquid storage bag. A high-pressure flushingdevice capable of circulating flushing fluid is formed at an operation wellhead of an oil-water well, and after an underground tubular column is pulled out of the wellhead, flushing operation of the pulled-out tubular column is completed below the mud umbrella. The labor intensity of workers is remarkably reduced, the operation efficiency is improved, and the use effect and the application value are remarkable.