The invention discloses a stratified sampling device for earth's surface soil and relates to the technical field of soil sampling. The stratified sampling device disclosed in the invention comprises acutter and a bucket, wherein a U-shaped frame is arranged in the bucket; T-shaped grooves are formed in two end faces of the U-shaped frame; multiple elastic mechanisms are uniformly distributed on the bottom side face of the bucket at the openings of the T-shaped grooves; T-shaped slide blocks matched with the T-shaped grooves are arranged on one side face of the cutter; a baffle is arranged onthe top side face of the cutter; blind holes matched with the top ends of the elastic mechanisms are formed in the bottom side face of the cutter and the bottom side faces of the T-shaped slide blocks; the cutter is fixed on the U-shaped frame by virtue of a fixed screw and a fixed block; a groove in normal running fit with an upright post is formed in the end of the output shaft of the fixed screw; a T-shaped block matched with the T-shaped groove is arranged on one surface of the fixed block. According to the stratified sampling device disclosed in the invention, the soil surface is sampledby using the bucket, capping mass and sundries on the soil surface can be scraped by the cutter, and the aim of removing the capping mass and sundries on the soil surface while sampling the surface soil is achieved.