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The gas monitoring system based on unmanned aerial vehicle (UAV) has several problems, such as less parameters, complex circuit structure and poor expansibility.In this paper, field programmable gate array (FPGA) is proposed as the main control chip, which integrates the interface communication function, control function, data cache function and data processing function into the chip, and realizes the real-time synchronous monitoring of various gases by means of multi-channel parallel transmission and processing.The experimental results show that the scheme is feasible and can be completed on the temperature and humidity, PM2.5/10, nitrogen dioxide, sulfur dioxide, ozone and other eight kinds of synchronous real-time data acquisition of gas content at the same time increase the flexibility of the system, The single-channel communication rate is 9600bit/s, and the accuracy of gas concentration can reach 1PPB, is helpful for the dismantling and the expansion of the system, and the hardware structure, volume, data real-time acquisition rate, has improved.