The self-falling drum mixer is a self-falling concrete mixer with a double-conical mixing drum that stirs when rotating forward and discharges when rotating backward. It can mix plastic and semi-dry hard concrete. The mixing drum of this machine is driven by a gear ring, featuring reliable transmission, low noise, low energy consumption, compact structure, stable operation, easy operation, good mixing quality, and high productivity. It is suitable for general construction sites, roads, bridges, hydropower projects, and small- and medium-sized concrete component factories. Optional equipment models and diesel-powered versions are available.