The utility model relates to an anti-collision overwinding valve of a novel winch. A mandril valve (6) is arranged on the upper part of a valve body (8); a mandril head (9) of the mandril valve (6) is arranged on the upper part of a cavity (10) arranged at the lower part of the valve body (8); the upper part of a mandril (1) is inserted in the cavity (10) at the lower part of the valve body (8); the upper end of the mandril (1) is sleeved with a buffer slide block (4) and a spring (5), and the spring (5) is arranged below the buffer slide block (4), two ends of a spring (2) are respectively sleeved on the mandril head (9) and the buffer slide block (4); and the lower part of the mandril (1) is fixed with a mandril head (3). The utility model has better mandril stress, prolongs the service life of the overwinding valve, resets depending on the springs, improves the work efficiency, reduces the fatalness, lightens the working intensity of drillers, and is safe, effective and rapid.