Operation environment safety monitoring linkage alarm system used in limited space

The invention discloses an operation environment safety monitoring linkage alarm system used in a limited space. The system comprises a composite gas detector, a behavior sensing terminal, an intelligent box body, a field operation management terminal and a cloud platform. The composite gas detector is used for detecting whether toxic and harmful gas exists in the cable or the foundation pit or not and transmitting detection data to the field operation management terminal; the behavior sensing terminal is used for detecting whether an operator goes down a well or not, and sending alarm information to the field operation management terminal when a dangerous situation occurs underground; the field operation management terminal is used for receiving the data sent by the field operation management terminal and carrying out display and alarm prompt; the problem of lack of operation safety supervision in a limited space is solved, an effective supervision early warning mechanism is formed, and personnel safety is e