As a double-horizontal-shaft forced type concrete mixer, the JS series concrete mixer has been provided with double superiorities, that is single-independent work and combinatorial function with PL series burden machine, also provide the matching engine for mixing plant, and so it applies to all kinds of large, middle and small scale prefabricated-component factory as well as industry and Civil Construction like highway railway bridge irrigation works dock and so on. With a high efficiency, this machine can be applied to all kinds of material, such as harsh concrete plastic concrete lightweight aggregate concrete and others.