Planetary concrete mixer

The invention discloses a planetary concrete mixer, which comprises a lower barrel body and a plurality of helical ribbon mixing devices, wherein a middle barrel body is connected to the upper part of the lower barrel body; a planetary gear mechanism is arranged in the middle barrel body; a cover plate is arranged at the upper end of the middle barrel body; a mixing drive device is arranged on the cover plate; a mixing input shaft is rotationally connected in the middle of the cover plate; the planetary gear mechanism comprises planetary racks, sun wheels and a plurality of planetary wheels; the planetary racks are connected to the lower end of the mixing input shaft; the sun wheels are sleeved on the mixing input shaft; the upper ends of the sun wheels are connected with the middle barrel body; planetary wheel shafts are arranged on the planetary racks; the planetary wheels are mounted on the planetary wheel shafts; each helical ribbon mixing device comprises two mixing arms; mixing helical ribbons are connected on the inner side surfaces of the two mixing arms; the upper parts of the two mixing arms are connected through a connecting plate; the lower ends of the planetary wheel shafts are connected with the connecting plates; and a vibration mechanism is arranged in the lower barrel body. According to the planetary concrete mixer, the microcosmic uniformity of concrete can be effectively improved.