The invention provides a dyeing device of a warp knitting machine and belongs to the technical field of dyeing of woven cloth, aiming at solving the problems of an existing dyeing device of the warp knitting machine that dyeing liquid is easily lacked and dyeing is not uniform. The dyeing device of the warp knitting machine comprises a dyeing machine body; a water inlet, a feeding hole, a discharging hole, a heating pipe, a rotary shaft and a motor for driving the rotary shaft to rotate are arranged at the end of the dyeing machine body; the dyeing machine body further comprises a water level device arranged on one side of the discharging hole; the water level device comprises a shell body, a water level induction assembly and an alarming device; the shell body is communicated with an inner cavity of the dyeing machine body; the shell body is provided with a transparent observation window; the water level induction assembly is arranged in the shell body; and the alarming device is electrically connected with the water level induction assembly. The technical defect of an existing dyeing device of the warp knitting machine that the dyeing liquid in the device cannot be observed is overcome, and the uniformity of the dyeing of cloth can be guaranteed.