The invention relates to a Y-type stop valve. The stop valve comprises a valve body 1, a seat ring 2, a valve element rod 3, an inverted sealing ring 4, an anti-rotation guide sleeve 5, combined packing 6, a clamping part 12, a movable rod 13, a support frame 11 and a driving part. The seat ring 2 is fixedly connected with the valve body 1, and the inverted sealing ring 4 is compressed into the valve body 1 through the anti-rotation guide sleeve 5, the valve body 1 and the valve element rod 3 are both of an integrated structure, a valve element and a valve rod are combined into one, when the stop valve is switched off, a valve-element sealing surface 3.1 and a seat-ring sealing surface 2.1 cooperate and form a sealing pair, when the stop valve is completely switched on, an upper sealing surface 3.2 of the valve element rod 3 and the inverted sealing ring 4 form sealing, the clamping part 12 is spherically articulated with the movable rod 13, and the upper end of the movable rod 13 andthe driving part form a kinematic pair. Through the above structure design, the structure of the Y-type stop valve is simplified, the technical problems are solved that the sealing surface of a Y-typestop valve is prone to erosive wear and the valve is prone to internal leakage and external leakage, and the service life of the valve is prolonged.