Viscous powdery emulsion explosive for top hole and preparation method thereof

The invention discloses a viscous powdery emulsion explosive for hole jacking, which is prepared from the following raw material components in percentage by mass: 85.277 to 86.854 percent of ammonium nitrate, 0.283 to 0.287 percent of sodium nitrate, 6.440 to 6.559 percent of water and 6.3 to 8.0 percent of high-viscosity compound oil phase, and the sum of the mass fractions of the components is 100 percent. The viscosity of the powdery emulsion explosive is improved, and the problem that the pneumatic charging amount is high is solved. The invention also discloses a preparation method of the viscous powdery emulsion explosive for the top hole. The preparation method comprises the following steps: weighing raw materials, preparing an aqueous phase solution, preparing an oil phase solution, mixing the aqueous phase solution and the oil phase solution to obtain a mixed solution, pulverizing, cooling and sieving to prepare the viscous powdery emulsion explosive for the top hole. According to the invention, the p