The invention relates to environment-friendly, polysilanyl and strongly-inhibitive drilling fluid which is applied to the technical field of petroleum geology exploration and development. The environment-friendly, polysilanyl and strongly-inhibitive drilling fluid comprises the following components in parts by weight: 1-1.5 parts of silicate A, 2-2.5 parts of silicate B, 2-2.5 parts of a silicon-based rheolobic modifier, 1-1.5 parts of a silicon-based high-temperature stabilizer, 1-1.5 parts of a conservation adhesive, 3-4 parts of a weak-gel filtration reducer with high temperature tolerance, 0.5-1.0 part of an anti-temperature natural fluid loss agent, 4-5 parts of an ideal filling agent, 1.5-2 parts of an emulsion blocking agent, 0.7-1.0 part of a potassium ion alkaline regulator, 3-4 parts of sodium bentonite, and 76-81 parts of water. With the adoption of the drilling fluid, the capacity of inhibiting mudstone can be further improved, and the hydration of the mudstone is reduced, and the well wall stability losing risk caused by the mudstone hydrating and expanding can be reduced; meanwhile, the problems of difficult adjusting of rheological property and control and large filter loss of a traditional silicate system can be solved, and the environmental pollution caused by a large amount of inorganic salt added can be avoided.