A glacial acetic acid infrared gas sensor based on nondispersive infrared principle is proposed. The principle of the glacial acetic acid infrared gas sensor is presented. Then, the structure design of the sensor is described in detail. The optical path of the sensor is simulated by using the LightTools simulation software. Finally, the prototype of the glacial acetic acid infrared gas sensor is obtained. The test results show that the measurement accuracy of the sensor is better than ±1% F.S. in the range from 0 to 5000 ppm. Its response time (T90) is 29 s. In the light source of the sensor, electric modulation is used and the mechanical chopper structure in the light source of the traditional infrared gas sensor is removed. Thus, the volume of the sensor is reduced and its stability is improved. So, this sensor has a wide application prospect in the fields of acetic acid transportation, storage and use etc.