Composite mixing plant

The utility model discloses a composite mixing plant which comprises a first mixer and a second mixer arranged on the first mixer, the first mixer and the second mixer are respectively a horizontal mixer and a vertical mixer, and compared with single-machine mixing, step-by-step mixing can be realized, the mixing efficiency is improved, and the productivity of the mixing plant is improved. The system further comprises a pre-feeding hopper, a powder bin, a first weighing bin and a second weighing bin, the first weighing bin is fixedly connected to the second weighing bin, the second weighing bin is communicated with the two stirring machines and is also communicated with the two stirring machines through the pre-feeding hopper and the powder bin, and the discharging sequence of different materials is controlled through the controller. The concrete stirring machine is simple in structure, can be compatible with various different concrete stirring processes, can carry out single/double-machine stirring according