The invention discloses a high-strength VR head-mounted display shell and a preparation method thereof. The preparation method comprises the following steps: mixing silicon micropowder and an ammoniumpolyphosphate solution, performing a reaction at temperature of 70-80 DEG C for 1-2 h, and performing filtering to obtain modified silicon micropowder; mixing the modified silicon micropowder, acrylic resin, chlorinated polyethylene, diatomaceous earth, phenolic resin, zinc stearate, a filler, a lubricant and a plasticizer to obtain a mixture M; and adding the mixture M into a twin-screw extruder, performing extrusion, and performing molding to obtain the high-strength VR head-mounted display shell. The method disclosed by the invention solves the problem that superior mechanical properties and flame retardance of a current high-strength VR head-mounted display shell are very difficult to ensure at the same time..