The invention relates to a scissor valve which comprises a long scissor body, a short scissor body, a scissor main pin and two connecting rods, wherein the long scissor body is provided with a first main pin hole and a first connecting rod hole; the short scissor body comprises an auxiliary blade and a blade pin; the short scissor body is provided with a second main pin hole, a second connecting rod hole and a first blade pin hole; the auxiliary blade is provided with a second blade pin hole; the blade pin pass through the first blade pin hole and the second blade pin hole so as to ensure that the short blade and the auxiliary blade are articulated; the scissor main pin passes through the first main pin hole and the second main pin hole so as to ensure that the long scissors body and the short scissors body are articulated; and one ends of the connecting rods are respectively articulated with the first connecting rod hole and the second connecting rod hole through articulated shafts. According to the invention, the technical scheme of adding the auxiliary blade to the short scissor body is adopted, when the scissor valve is in a close state, parallelism errors caused by rubber pipe abrasion or mechanical abrasion are compensated by virtue of the auxiliary blade, thus the problem of material leakage is solved effectively.