The invention discloses a life detection system of a gas drainage pipe based on a strain gauge. The system comprises the strain gauge stuck on the surface of a drainage pipe, a signal amplification system, two single-chip microcomputers and a power supply. Firstly, the strain gauge is used to monitor the deformation of the drainage pipe, then the series connection with the signal amplification system is achieved through a conductive wire, and a single-chip microcomputer 1 is connected in series with the signal amplification system and receives a wirelessly transmitted drainage pipe deformationsignal and wirelessly transmits a signal to the single-chip microcomputer 2. The single-chip microcomputer 2 is used for receiving a signal of road way transmission transmitted by the single-chip microcomputer 1 and carrying out automatic analysis and judgment, and an alarm is automatically issued when the destruction of the gas drainage pipe is detected. The system has the advantages of a smallsize and high applicability and can be used in various drainage environments. According to the magnitude of gas drainage pipe strain data, the automatic analysis is carried out, and whether the alarmis issued or not is judged. The response is sensitive, and the alarm can be issued in a short time. The use of the gas drainage pipe can be observed well.