Underground water volatile organic compound in-situ sampling device and detection method

The invention relates to the technical field of water source detection, and discloses an underground water volatile organic compound in-situ sampling device and a detection method.The underground water volatile organic compound in-situ sampling device comprises a housing structure, the housing structure comprises an outer pipe, an inner pipe and an end cover, and the end cover is arranged on the inner pipe; a channel for liquid to flow into the inner pipe is arranged between a pipe opening of the inner pipe and the end cover, and the outer pipe is detachably connected with the end cover. The purging structure comprises a water spray flow collecting cover, a gas conveying pipe and a gas collecting pipe, the water spray flow collecting cover is arranged in the inner pipe, a pipe opening of the gas conveying pipe is located at the end, facing the end cover, of the water spray flow collecting cover, and a pipe opening of the gas collecting pipe is located at the end, away from the end cover, of the water spray fl