Oil gas recovery gas phase pipe anti-reflux structure

The utility model relates to the technical field of oil gas recovery, and discloses an oil gas recovery gas phase pipe anti-backflow structure which comprises a gas phase pipe, a fixing plate is arranged at the gas inlet end of the gas phase pipe, and a through hole is formed in the side face of the fixing plate and used for oil gas to enter. After filling is completed, the check valve plate overturns downwards and resets under the action of gravity, at the moment, the side face of the check valve plate shields an opening of the penetrating hole, oil gas in the gas phase pipe cannot overflow from the opening of the penetrating hole, and the anti-backflow effect is achieved. The recovery rate of the oil-gas recovery system is ensured, the condition of oil-gas concentration increase in an oil distribution site is avoided, and the safety is ensured; the contact area between oil gas in the gas phase pipe and the side face of the check valve plate is increased through the arc-shaped grooves, so that the side face