Abstract: Drilling, downhole operation and oil well testing will generate associated gas which has high content of methane, ethane, small content of volatile liquid hydrocarbon as well as trace amount of carbon dioxide, nitrogen, hydrogen sulfide and other impurities, bringing about major hidden danger to production safety. An autoignition burner is developed, which adopts solar panel to provide energy. When associated gas pressure exceeds 0.1 MPa, control system will enable automatic ignition to ignite liquefied gas combustion rod, thus to ignite the associated gas in combustion area. It is shown from field application that the burner features reasonable structure design, convenient assembly or disassembly and transportation, and is not easy to generate open fire, thus the burner is safer and more reliable than previous similar manual products.