The invention discloses a coating layer for fracturing bomb propulsive agents and a preparation method therefor. The method comprises steps: by weight, 78.7%-86.2% of silicone modified epoxy resin, 4.3%-7.9% of hydroxyl-terminated polybutadiene, 0.86%-1.6% of organosilicone water repellent and 8.6%-11.8% of polyamide curing agents are prepared, mixed evenly, and defoamed for 10-15 min under vacuum to obtain gel materials, the gel materials are sprayed on the propulsive agent coating surface which is to be coated, and placed at the room temperature for 2-8 h to obtain the coating layer for fracturing bomb propulsive agents. The coating layer has good performances of resistance to water, resistance to oil, resistance to acid, alkali and salt solutions, resistance to high temperature, resistance to high pressure and resistance to dropping, and has a good compatibility with the propulsive agents. The coating layer has good flowability, with a viscosity of 300-1000 cps, is suitable for pouring, spraying, brushing and other coating and molding technologies, and is advantaged by simple technology, convenience and reliable molding.