Modularized distributed sewage treatment device

The utility model creatively provides a modularized sewage treatment device, a first filter cavity, a second filter cavity, a third filter cavity, a biochemical reaction cavity, a fourth filter cavity, a purification cavity and a water tank which are communicated in sequence are arranged in a box body, a first filter mechanism is arranged in the first filter cavity, a second filter mechanism is arranged in the second filter cavity, and a third filter mechanism is arranged in the third filter cavity. A plurality of activated carbon plates are arranged in the third filter cavity, an aerator is arranged in the biochemical reaction cavity, a fourth filter mechanism is arranged in the third filter cavity, and an ozone generator is arranged in the purification cavity; the first filtering cavity is used for removing large-particle impurities in sewage, the second filtering cavity is used for removing small-particle impurities in the sewage, the activated carbon plate in the third filtering cavity is used for adsorbi