The invention provides an invert-emulsion drilling fluid, which comprises basic oil, brine, an emulsifier, a wetting agent, lipophilic colloid, a fluid loss additive, a shearing potentiator, an alkalinity conditioning agent, and a weighting agent. The invert-emulsion drilling fluid has the characteristics of low funnel viscosity and plasticity viscosity, and high dynamic shearing force and static shearing force; the yield point/plastic viscosity ratio is more than or equal to 0.30, the drilling fluid can sustain a temperature as high as 200 DEG C, so the drilling fluid is suitable for being used in a high temperature deep well, and a plurality of oils such as diesel oil, white oil, gas-liquefied oil, and the like can be used to carry out construction. Solved are the technical problems that the funnel viscosity and plasticity viscosity of the conventional invert-emulsion drilling fluid system are too high, and the dynamic shearing force and the static shearing force are too low.