The utility model relates to a single-spinning-roller semicontinuous high-speed spinning machine which comprises a rack, a glue supply device, a silk forming device, a spinning device and a winding device. The spinning device comprises a spinning roller, the spinning roller is transversely arranged relative to the operation face of a spinning face or a twisting face, and the two ends of the spinning roller are fixed to the rack. The aim of improving spinning speed is achieved, meanwhile, silks are enabled to be fully reacted, and then the aims of guaranteeing silk quality, improving production efficiency and lowering spinning cost are achieved.