The utility model discloses a device for measuring the temperature and the humidity of process gas and the temperature and the water content of materials in a tobacco product line cut-tobacco drying cylinder. A rotary shaft is arranged in the tobacco product line cut-tobacco drying cylinder along the axis of the cylinder, a front chamber cover and a rear chamber cover at the two ends of the cylinder are respectively and fixedly provided with a bearing flange, and the two ends of the rotary shaft are connected with the bearing flange; the rotary shaft is fixedly provided with a sliding supporting frame located in the cylinder, the length of the sliding supporting frame is the same as that of the cylinder, the section of the sliding supporting frame is V-shaped, temperature and humidity sensors are arranged in the sliding supporting frame at equal intervals, material sampling boxes are further arranged on the sliding supporting frame at equal intervals, and the material sampling boxes and the temperature and humidity sensors are distributed in a spaced mode. The device meets the requirement for knowing temperature and humidity change situations of the materials in the cylinder and situations of heat exchange between the materials in the cylinder and process gas flow.