The utility model relates to a magnetism mud valve for well drilling is mainly said by internal thread, external screw thread, solid fixed valve, solid fixed valve drilling fluid runner, traveling valve, traveling valve drilling fluid runner and the smooth movable rail of traveling valve and constitutes. When magnetism mud valve for well drilling is arranged in solving drilling operation increasedrilling rod, spill over the drilling fluid incremental cost, influence normal drilling operation scheduling problem. When magnetism mud valve for well drilling increased the drilling rod in drillingoperation, gu fixed valve is in the same place owing to magnetic action hugs closely with the traveling valve, the mud valve was closed, and the drilling fluid is whole to be sealed up up for safekeeping in the kelly on upper portion, after the installation of new drilling rod finishes, high -pressure well drilling liquid will hug closely solid fixed valve and traveling valve and part, and the drilling fluid gets into the lower part drilling rod through solid fixed valve and traveling valve drilling fluid runner together. Behind installation magnetism mud valve for well drilling, the drillingfluid loss of the new drilling tool in -process of remove connection, reduce cost reduces accident rate, saves drilling time, improves well drilling efficiency.