The invention discloses a code writing device for a cloth inspecting machine. The code writing device comprises a base, a roll feeding support and a roll receiving support, wherein the roll feeding support and the roll receiving support are arranged on the base; a first connecting rod is arranged on the base, and the lower end of the first connecting rod is in rotary connection with the base; the upper end of the first connecting rod is connected with the end of the roll feeding support; a first hydraulic cylinder is arranged on the base, the bottom of the first hydraulic cylinder is in rotary connection with the side wall of the base, and a telescopic rod of the first hydraulic cylinder is rotatably connected to the middle of the first connecting rod; and four nozzles distributed in a spaced mode are arranged on the base, and the nozzles are located between the roll feeding support and the roll receiving support. According to the code writing device for the cloth inspecting machine, through cooperation of an infrared transmitter and an infrared receiver, code writing for cloth is conducted; and meanwhile, through the adjustable roll feeding support and roll receiving support, the cloth can show appropriate tensity, and further precision of code writing can be improved.