Large-volume solid-phase extraction device

The invention belongs to the technical field of chemical analysis articles, and particularly relates to a large-volume solid-phase extraction device which comprises a large-volume sample bottle, the lower end of the large-volume sample bottle is sequentially connected with a flow guide hose, an adapter and a solid-phase extraction column in a sealed mode, an annular pipe is arranged above a tail liquid collecting box, and a plurality of solid-phase extraction column connectors are evenly formed in the top of the annular pipe in the circumferential direction. A plurality of liquid guide pipes are arranged at the bottom of the tail liquid collecting box, and a liquid accumulation sealing cavity which is divided into a cavity I and a cavity II by a partition plate is formed in the top position of the tail liquid collecting box; a liquid drainage gap is reserved in the lower end of the partition plate, the lower end of a liquid guide pipe is communicated with the first cavity in a sealed mode, an air pressure adj