Method for improving organic matter of paddy field soil

The invention discloses a method for improving organic matter of paddy field soil. The method specifically includes the following steps: S1, separating out harmful heavy metals such as lead, cadmium,arsenic, chromium and mercury in a paddy field, and collectively treating the harmful heavy metals; S2, evenly spreading a modifying agent and an agricultural microbial agent to the flattened surfaceof the paddy field; S3, performing fertilization and field management on an improved parcel of the paddy field according to a conventional cultivation method, performing rice transplanting, changing water 3-4 times monthly in a growth stage of seedlings to eliminate salt and reduce alkali, and completing improvement of the organic matter of the paddy field soil. The method has the advantages thatlocal resources are fully utilized, waste is turned into treasure, productivity of land and resource utilization efficiency are improved, and a potential risk of polluting the environment and rice production by large-scale appl