The utility model relates to a peanut leaf sampling device. The peanut leaf sampling device comprises a juice chamber, wherein a supporting chamber is arranged on the juice chamber; a hydraulic column is arranged in the supporting chamber; a supporting column is connected onto the hydraulic column; a movable column is arranged on the supporting column; a fixed blade is arranged on the lower part of the movable column; a movable blade is arranged on the upper part of the movable column, and a handle is arranged at the other end of the movable blade; a slideway is arranged on the upper wall surface of the supporting chamber; a slide block is arranged in the slideway and is connected with the supporting column; a liquid discharge tube is arranged on the upper side wall of the juice chamber, and a leaf collecting chamber is arranged on the top part of the liquid discharge tube and below the fixed blade. The peanut leaf sampling device disclosed by the utility model can be used for effectively sampling peanut leaves and is adjustable in height and position; meanwhile, after sampled leaves fall into the leaf colleting chamber, produced juice enters the juice chamber through the liquid discharge tube, so that the peanut leaves and juice can be researched and used according to needs.