The invention relates to the field of textile machinery and specifically relates to a selvedge tensioner. The selvedge tensioner comprises a yarn guide device, a yarn guide base and a guide device, wherein the guide mechanism comprises a rotation shaft disposed on the yarn guide base and a guide wheel in rotational connection to the rotation shaft; a yarn guide rod is connected between the yarn guide device and the yarn guide base; the yarn guide rod comprises a rod body, a connecting end and a fixed end; the yarn guide device is installed on the connecting end in a dismountable manner; and the fixed end is connected to the yarn guide base in a dismountable manner. According to the invention, the structure is simple; only the yarn guide device needs to be clamped to an upper clamping area of the yarn guide rod by a clamping hole, and positioning is conducted by a clamping groove, a clamping pillar and an insertion hole; connection is stable; disassembly and replacement are convenient; and replacement cost is reduced.