The invention relates to a V-shaped ball valve. The V-shaped ball valve is characterized by further comprising a scraper and a conversion sleeve, wherein the scraper is arranged in an inner cavity ofthe valve body and is arranged outside a V-shaped ball body; the scraper is equipped with a circular-arc-shaped blade which can be matched with a valve clack sealing surface to scrape off a medium onthe surface of the valve clack sealing surface; the upper end of the scraper is in key type connection to a valve rod; the lower part of the scraper is equipped with a positioning ring; the positioning ring extends into the lower end of the valve rod, and is matched with the valve rod to limit the scraper from moving up and down; the V-shaped ball body is further fixedly equipped with a positioning sleeve; the positioning sleeve is of a circular tube type structure, and sleeves at the outer circle of the valve rod; a spiral type groove which takes the axis of the valve rod as a center line isformed in the positioning sleeve; the conversion sleeve is arranged on the lower part of the positioning sleeve; a positioning rod which extends into the spiral groove is arranged on the upper part ofthe conversion sleeve; the inner part of the conversion sleeve is in threaded connection to the valve rod; and the lower part of the conversion sleeve is equipped with a straight rod which extends into the lower end of the valve rod and can prevent the conversion sleeve from rotating. The V-shaped ball valve has the advantages of cleaning the valve clack sealing surface, being not liable to generate leakage, and being long in service life.