The invention relates to a sample collecting method comprising the following steps of: supplying blow-out airflows to the middle of a collection surface by using a blowing hole; sucking the blow-out airflows from the periphery of the collection surface by using an air suction hole; supplying a sample collecting device on the collection surface, wherein the sample collecting device comprises the blowing hole positioned in the middle of the sample collecting device and the air suction hole positioned on the periphery of the sample collecting device; supplying blow-out airflows from the air suction hole to the collection surface; and sucking the blow-out airflows which blow to the collection surface from the air suction hole so as to collect a sample. The invention also provides a sample collecting device comprising a shell, the blowing hole and the air suction hole, wherein the blowing hole is positioned in the middle of the shell and used for supplying the blow-out airflows; and the air suction hole is positioned on the periphery of the sample collecting device and used for sucking air. Due to the adoption of the invention, the higher sweeping airflow speed can be obtained without supplying larger-flow-rate sweeping airflows, blown-out grains move towards the periphery along with the airflows and are sucked by a peripheral sucking device, and the efficiency is higher.