Anti-leakage high-performance water-based drilling fluid and preparation method thereof

The present invention relates to an anti-leakage high-performance water-based drilling fluid, which comprises 100 mL of water, 1-3 g of an efficient inhibitor, 1-3 g of a nano-micron blocking agent, 3-5 g of an efficient lubricant, 0.3-0.7 g of a tackifier, 0.3-0.5 g of a filtrate reducer, 3-5 g of an activity control agent, and 20-150 g of a weighting agent by adopting the volume of the water as the reference. The anti-leakage high-performance water-based drilling fluid system of the present invention has excellent performances of micro-crack opening inhibition, nano-micron-scale micro-crack blocking, and the like, and is the high quality drilling fluid for drilling of micro-crack development hard brittle mud shale and basalt stratum.