Modified resin composite material, preparation method thereof and cable holder

The invention belongs to the technical field of composite materials, and particularly relates to a modified resin composite material, a preparation method thereof and a cable bracket. The modified resin composite material provided by the invention comprises the following raw material components in parts by weight: 22-28 parts of polyetherimide modified bisphenol A epoxy resin; 9-12 parts of a low shrinkage agent; 4-7 parts of heavy calcium carbonate; 3-5 parts of a curing agent; 0.75 to 1.2 parts of zinc stearate; 0.2 to 0.3 part of magnesium oxide paste; and 20-25 parts of glass fiber chopped yarns. According to the invention, the raw material formula of the resin composite material is optimally designed, and particularly, the bisphenol A epoxy resin is toughened and modified by using polyetherimide, so that the mechanical property of the modified resin composite material in a low-temperature environment is greatly improved; potential safety hazards of a traditional cable support in a low-temperature environ