The invention discloses a grain sampling device capable of measuring sampling depth and relates to the field of grain storage. The grain sampling device comprises a sampling and storage room, whereinthe sampling and storage room is connected with a sampling and conveying hose; the sampling and conveying hose is connected with a sampling pipe; the sampling pipe is provided with an infrared range finder; the infrared range finder is connected with a single chip microcomputer; the single chip microcomputer is connected with a display screen; the infrared range finder comprises a transmission circuit, a door control circuit, a filtering amplification circuit and a receiving circuit. By adopting the grain sampling device disclosed by the invention, the problem that the sampling depth cannot bedisplayed in real time by a current grain sampling device is solved; the sampling quality and display quality are detected in a sampling process, the sampling precision is convenient to improve and asampling progress is convenient to know.