The invention discloses an improved warp knitting machine guide bar which comprises a guide bar plate, wherein a bracket is fixed at the top of the guide bar plate; a plurality of horizontal slots are formed in a side wall of the guide bar plate; a plurality of guide bar strip supporting blocks are inserted into the slots; a plurality of screw holes are formed in the rear side of the guide bar plate; the screw holes are communicated with the slots; bulb plungers are screwed in the screw holes; steel balls of the bulb plungers stretch into the slots and sleeve in the sunken holes in the back walls of the guide bar strip supporting blocks in the slots; the steel balls of the bulb plungers are pressed against the walls of the sunken holes; sliding chutes are formed in the front walls of the guide bar strip supporting blocks; sliding grooves are formed in the side walls, top surfaces and bottom surfaces of the sliding chutes; three sliding strips are respectively fixed on the side walls, top surfaces and bottom surfaces of the sliding chutes and cover the corresponding sliding grooves; a plurality of balls nest the sliding strips. All the parts of the improved warp knitting machine guide bar can be detached, so that the exchanging and repairing are convenient; the guide bar strip supporting blocks are conveniently detached; meanwhile, the sliding of the guide bar is realized in a point contact mode, so that the friction is small.