Chemical injection device for improving polluted soil and underground water

The utility model relates to the technical field of remediation of soil and underground water, in particular to a chemical injection device for improving polluted soil and underground water, which improves the operation convenience of the device and increases the functional diversity of the device. Comprising a storage tank, a main path control valve, a dispersion pipe, branch control valves, a mounting pipe, an adding funnel and a mixing mechanism, the main path control valve is mounted at a water outlet in the bottom end of the storage tank, the dispersion pipe is connected with the output end of the main path control valve in a matched mode, multiple sets of connecting pipes are arranged on the dispersion pipe, and the branch control valves are mounted on the dispersion pipe connecting pipes in a matched mode; the mounting pipe is mounted at the output end of the branch control valve, the mixing mechanism is mounted in a cavity of the storage tank, and the adding funnel is mounted at an adding opening of t