The present invention provides a circular type knitting machine for intarsia, which can stably knit a rib part of an object while firmly holding knitting yarns cut from the object. The circular type knitting machine includes a knitting needle cylinder (200) which is provided inside a plurality of cam support covers (251), a plurality of knitting yarn separating devices (400) which is circumferentially arranged on an annular support plate (130), and a cam mechanism including various kinds of cams and provided on the plurality of cam support covers (251). The circular type flat knitting machine further includes a knitting yarn gathering device (500) to gather a plurality of knitting yarns and to supply the plurality of knitting yarns to a center of the knitting needle cylinder (200). Thus, the knitting yarns, which have been separated for knitting a rib part of an object, are rearranged into a state for intarsia knitting. The circular type knitting machine further includes a rib knitting needle plate coupling unit (600) which moves a rib knitting needle plate (302) downwards to be selectively coupled to the knitting needle cylinder (200), and thereafter, rotates the rib knitting needle plate (302) relative to the knitting needle cylinder (200) around the center of the knitting needle cylinder within a predetermined angular range.