The series of mixer belongs to double-shaft compulsion concrete mixer and can mix dry-hard, fluid concrete and mortar. Because the tumbling box is enchased high-manganese wearable steel plate and mix vane, have the feature of ruggedization and change expediently. When assembled with feeder, the mixer can be applied as a complete mixing plant of durability, widely used for building, and widely be applied to all type of building site, roadway, bridge, airport, tunnel, etc. it bears the advantage of reasonable designing, operation convenience, reliable work, high efficiency, low lost, low noise and durable service life.