Casting mixture for epoxy casting transformer and preparation method thereof

The invention discloses a casting mixture for an epoxy casting transformer, which comprises the following raw materials in part by weight: 1 part of epoxy resin, 2.5 to 3.1 parts of silicon micropowder, 0.1 to 0.2 part of toughening agent, 0 to 0.02 part of color paste, 0.6 to 0.7 part of curing agent, and 0.001 to 0.003 part of accelerating agent. The preparation method for the casting mixture comprises the following steps: melting the materials; adding the silicon micropowder, the toughening agent, the color paste, the curing agent, and the accelerating agent in the melted epoxy resin in turn under the conditions of heating and stirring; and then performing vacuum defoamation. Due to the adoption of mixed glue prepared from the components of the casting mixture by the preparation method thereof, the crack ratio of a cast casting body can be reduced, and the quality of the product can be improved.