The utility model discloses a facility agriculture gas fertilizer monitoring system based on GSM. The system comprises a monitoring module which acquires the CO2 concentration in a greenhouse, a microprocessor module which is connected with the monitoring module, a SIM900 communication module which is connected with the microprocessor module, a clock module which is connected with the microprocessor module, a control execution module which is connected with the microprocessor module, and a power supply module which is connected with the modules to realize power supply. According to the utility model, GSM is used as a communication mode; a CO2 generation gas tank and an exhaust fan are used as control devices; greenhouse environment CO2 concentration remote and on-site accurate monitoring and early warning are realized; the system supports timing control, threshold control and other control modes; and the facility agriculture management level in China is effectively improved.