PBT (polybutylene terephthalate) composite material as well as preparation method and application thereof

The invention discloses a PBT (polybutylene terephthalate) composite material as well as a preparation method and application thereof. The PBT composite material comprises the following components: PBT resin, alkali-free glass fiber, epoxy resin, an antioxidant and a lubricant, and the intrinsic viscosity of the PBT resin is 0.88 dL/g to 1.16 dL/g. The preparation method of the PBT composite material comprises the following steps: 1) mixing PBT resin, epoxy resin, an antioxidant and a lubricant in parts by mass to obtain a premix; and 2) mixing the premix and the alkali-free glass fiber according to mass parts to obtain the PBT composite material. The PBT composite material provided by the invention takes the PBT resin as a main material, not only is low in content of additives such as a lubricant, epoxy resin and an antioxidant and does not need to use a flexibilizer, but also has the advantages of high mechanical strength, good water resistance and alkali resistance, convenience in processing and simplicity