The invention discloses portable outdoor high-accuracy equipment for monitoring concentrations of multiple gases. According to the equipment, power is stably supplied to an MCU, a PM2.5 gas sensor, a PM10 gas sensor, a CO gas sensor, a SO2 gas sensor, an O3 gas sensor, a temperature and humidity sensor and a WIFI module by output voltage of a lithium battery. The MCU is used for controlling an AD module to implement a process of converting analogue signal data of a part of gas concentration acquisition modules into digital signal data, and a PM2.5 gas concentration acquisition module and a PM10 gas concentration acquisition module are used for transmitting data to the MCU in an SPI mode. According to the equipment, the concentrations of the multiple gases in the outdoor air under a natural condition can be sensed to obtain high-accuracy data. The data is transmitted to a mobile phone terminal in a WIFI manner, and the real-time concentrations of all the gases, temperature and humidity data and power of a power supply are displayed. In addition, the equipment has the characteristics of high accuracy, small size, light weight, convenience for movement and monitoring, low power consumption, sensor replaceability, wireless transmission control and the like, and can be placed at any place where the equipment is needed.