Warp tension retaining mechanism

The utility model relates to a warp tension retaining mechanism of textile warping machine pertaining to textile machine technology field. The mechanism includes a yarn guide roll (10), an unidirectional roll (9), a ratchet (6), a pawl (4), a spring (5) and a cylinder linkage mechanism, said cylinder linkage mechanism includes has two sets of left set and right set, each set of cylinder linkage mechanism includes a cylinder (7), a mounting base (8), a swing bar (2) and a beam (1), the cylinder (7) is connected to the beam (1) by the mounting base (8), the cylinder piston lever (3) articulates with middle of the swing bar (2), an end of the swing bar (2) articulates with the beam (1), two ends of the unidirectional roll (9) articulate with the other end of left and right swing bar (2), the yard guide roll (10) is arranged on side of the unidirectional roll (9), the ratchet (6) is assembled on an end of the unidirectional roller (9) and articulated with the pawl (4), the pawl (4) articulates with middle of the swing bar (2), an end of the spring (5) connects to the swing bar (2), the other end connects to middle of the pawl (4). The utility model may avoid entanglement of billow yarn and yarn.