In view of the fact that the traditional VOCs harmful gas detection equipment cannot realize the function of saving and remote detection of gas data,a harmful gas detection system is designed in the paper,which combines single chip microcomputer,wireless communication,host computer and database technology.The system uses STM32 single chip microcomputer,combined with the auxiliary module MS1100 gas sensor and ESP8266-01S wireless module as the data acquisition device of the lower computer.Through the wireless module,the data is uploaded to the upper computer,and the function of detecting toluene,formaldehyde and other VOCs harmful gases in the monitoring space and uploading the data to MySQL cloud database for permanent storage is realized.