The invention provides a loop-pile cutting circular machine. A needle barrel is fixed on a large disc gear and sleeved by a lower disc saddle, a plurality of vertically-arranged needle triangles are arranged on the inner side of the lower disc saddle in the peripheral direction, and needle slots of the needle triangles of adjacent paths are connected to form knitting needle running tracks. A large tripod gear synchronously rotating with the large disc gear is installed on a large tripod, a knife disc tray is fixedly connected onto a lower shaft head of a gun barrel connected with the large tripod gear, a knife disc is arranged on the knife disc tray, a knife and hook assembly is installed on the knife disc, a knife disc saddle is arranged above the knife disc, and a knife and hook assembly triangle is arranged on the knife disc saddle. Fabrics woven by the loop-pile cutting circular machine are smooth in surface, free of hooked ends, high in hair side density, not prone to hair slip and soft in backing fabric, shearing, breaking and other after treatment steps can be omitted, and the production cost is greatly saved. The knife and hook assembly triangle adopts an arrangement mode that four paths form a group and is large in gap, not prone to shifting and good and stable in operation compared with arrangement modes of common machines.