Remote unattended automatic detection device for liquid level volatile gas and using method thereof

The invention discloses a remote unattended automatic detection device for liquid level volatile gas. The device comprises a floating plate and a gas collecting chamber, wherein a sliding door is arranged on the gas collecting chamber; a traction device which comprises a first gear, a second gear and a driving belt is arranged on the upper portion of the gas collecting chamber; the driving belt is connected to an electric cylinder; and a fixed hole which vertically penetrates through the floating plate is formed in the floating plate. The remote unattended automatic detection device for liquid level volatile gas comprises an anchor rod which can penetrate through the fixed hole, the lower end of the anchor rod is inserted into the bottom of a river and fixed while a limiting piece is fixed at the upper end of the anchor rod, and the outer diameter of the limiting piece is greater than that of the fixed hole, so that the floating plate cannot be pulled away from the anchor rod; a power supply and a central con