The utility model discloses a combined sieving device of a peanut combined harvester, which comprises a vibration sieve, a dust fall supporting plate, a blower, a cage sieve and a tooth-shaped sieve. The combined sieving device is characterized in that the vibration sieve mounted in front of the tooth-shaped sieve is formed by 35 to 50 vibration sieve strips; the dust fall supporting plate is mounted below the vibration sieve; the blower is mounted below the dust fall supporting plate; the opening of the blower is in oblique angle arrangement and aims at a position below the joint of the vibration sieve and the tooth-shaped sieve; and the cage sieve is formed by cage rotating blades and 35 to 50 strip-shaped sieves, and is mounted below the tooth-shaped sieve. The combined sieving device has high adaptability to peanut planting mode, and is particularly suitable for harvesting peanuts planted in mulching films. The removal rate of the combined sieving device to soil, peanut stem, leaves, mulching film, and the like can reach 95% and the selected peanuts are clean and have less impurity.