Sewage treatment system and sewage treatment method

The invention provides a sewage treatment system and a sewage treatment method.The sewage treatment system comprises a reaction container and a membrane filtration assembly, an adsorption separation cavity, an interception cavity, a water inlet, a water outlet and a discharge outlet are formed in the reaction container, and the water inlet, the adsorption separation cavity, the interception cavity and the water outlet are sequentially communicated; the discharge outlet is communicated with the adsorption separation cavity; the membrane filtration assembly comprises a membrane filtration material with the porosity of 90% or above, the membrane filtration material is arranged in the interception cavity, after to-be-treated sewage entering from the water inlet is treated by an adsorption separation material or an agent in the adsorption separation cavity, the adsorption separation material or the agent is filtered out by the membrane filtration material, and the water flows out from the water outlet. The method