The invention discloses a frame yarn finishing device for textile and a using method thereof and relates to the field of frame yarn finishing. The frame yarn finishing device comprises a bottom plate,a supporting rod is fixedly mounted in the middle, close to each of two sides, of the outer surface of the upper end of the bottom plate, a fixing sleeve is fixedly mounted on the outer surface of the upper end of each supporting rod, a placement box is arranged between the two fixing sleeves, a connection rod is fixedly connected between the outer surface on two sides of the placement box and the corresponding fixing sleeve, a cam is arranged inside the placement box, and connection holes are formed in the outer surface of the upper end of the cam. The using method includes following steps that a motor is started to drive the cam to rotate, the cam drives a push rod and an extension rod to enable a frame yarn arm to inwards contract or outwards extend, and the frame yarn arm loosens andstraightens frame yarn. Production efficiency of the frame yarn finishing device can be improved, labor intensity of workers can be relieved, occupied space of the frame yarn finishing device can be reduced, and using performance of the frame yarn finishing device can be improved.