The utility model discloses a cotton fiber detection device, a cotton fiber detection device, the device comprises a device body, operation panel and control panel, the below welding of device body isprovided with the operation panel, the upper surface left side electric connection of operation panel has control panel, and control panel comprises current computer response technique, lead wire boxfixedly connected with test box body is passed through on control panel's right side, and testing cassette position in operation panel upper surface right side, the sealed lid of top fixedly connected with of test box body, the upper surface of sealed lid closely welds there are two handles, and parallel arrangement between two handles. This kind of cotton fiber detection device is equipped withtwo on the right side of gas flow detector and detects the stick, and just two equal electric connection of detection stick through the gas flow detector, cooperate gaseous flow controller on the gasflow detector, can measure thickness and the maturity of cotton.