The invention discloses a high glass fiber content enhanced high-temperature nylon composite material and a preparation method thereof. The high glass fiber content enhanced high-temperature nylon composite material is composed of five components by weight: 30-90 parts of high temperature nylon resin, 20-60 parts of chopped glass fiber, 1-10 parts of a flexibilizer, 0.1-1 part of an anti-oxidant and 0.2-2 parts of a lubricant, Compared with the commonly used glass fiber reinforcement high-temperature nylon composite material on market, the tensile strength, the tensile modulus, and the impactintensity of the high glass fiber content enhanced high-temperature nylon composite material are greatly increased.