The utility model relates to a wastewater treatment system, it includes aeration tank and filtering ponds. This wastewater treatment system's aeration tank is through sinking sand and aeration, can make solid impurity deposition most in life, the construction sewage in the bottom of aeration tank, plays preliminary solid -liquid separation's effect, and simultaneously, the aeration tank can provide the aerobic environment for the aquatic microorganism, is convenient for have oxygen partial pressure to separate, has also suppressed the anaerobic effect, is favorable to reducing malodorous production. Filtering ponds pass through the multi -stage filtration unit and filter, can obviously improve the quality of sewage discharge, reduce organic matter content. But this wastewater treatment system wide application is closed in various lives, construction sewage disposal field, like power transmission and transformation engineering project's job site, can directly use on -the -spot raw and other materials, it is like preparation such as dumped template, safety net, river sand, stones, with low costs to can use back recycle in the construction, need not other purchase.