The utility model provides a circle strip subassembly for CJ40 comber, carries the combing strip to the circle strip subassembly in through the draft subassembly, circle strip subassembly including transmission, press and congeal the pair roller, turn over the board, bring together mouthful and the circle can, pair roller department is congealed through bringing together mouthful to carry the combing strip to pressing to the transmission, carries at last to enclose the can in, it fixes in the frame through turning over a board piece to turn over the board, turn over board one end and turn over articulated connection of a board piece, bring a mouthful setting together and turning over the other end of board, the transmission piece is including tension roll, big conducting bar roller and conducting bar wheel, the tension roll is fixed on the frame backplate with big conducting bar roller, the tension roll lies in one side of big conducting bar roller, and the conducting bar wheel lies in the opposite side of big conducting bar roller, the conducting bar wheel is fixed on turning over the board through the conducting bar riser. The utility model discloses simple structure, it is convenient to install, under the prerequisite that can not reform transform greatly the CJ40 comber, ensures effectively that the combing strip is at ring product quality of strip in -process.