The invention relates to intelligent blocking water-based drilling fluid. The intelligent blocking water-based drilling fluid comprises, by weight, 100 parts of seawater or fresh water, 1 part to 5 parts of sodium bentonite, 0.2 part to 1 part of pH regulating agent, 0.5 part to 2 parts of fluid loss agent, 0.1 part to 0.6 part of flow pattern regulating agent, 5 parts to 25 parts of water activity regulating agent, 1 part to 4 parts of blocking agent, 1 part to 4 parts of blocking anti-collapse agent, 1 part to 3 parts of shale inhibiting agent and 0.2 part to 1 part of shale encapsulating agent. The intelligent blocking water-based drilling fluid can flow into a stratum along with filter liquor and can be intelligently matched with cracks and holes in shape when encountering stratum water to fill space and be cemented with stratum matrixes, a compact and firm integral structure can be formed, the porosity and the permeability can be reduced, and further invading of the filter liquor can be prevented; meanwhile, the strength of the stratum can be improved, and the stratum stability losing problem can be solved; in addition, compared with oil-based drilling fluid, the intelligent blocking water-based drilling fluid is more environmentally friendly and lower in cost.