Halogen-free heat-proof low-smoke and flame-retardant polyester compound and preparation method thereof

The invention relates to a halogen-free heat-proof low-smoke and flame-retardant polyester compound and a preparation method thereof. The compound comprises polyester resin (1), a phosphate (phosphite ester) and phosphate (phosphite) composite flame retardant (2), a flexibilizer (3), an enhancement and reinforcement modifier (4), an accelerant (5) and an additive (6), which are injected into a high-speed mixer to be mixed according to a certain weight ratio and injection sequence so as to obtain a semi-finished product; and the semi-finished product is added into an equidirectional double-screw extruder through a quantifier to be extruded and pelletized to obtain the product. The polyester compound can be made into a plastic workpiece with a complicated structure, a favorable appearance and an extremely short forming period through mould pressing or injection moulding, has favorable runnability and heat resistance, as well as very low mist generation quantity, in high-speed injection-moulding forming, also has remarkable heat resistance, UV resistance and dimensional stability, reaches the 500 V comparative tracking index and can satisfy the UL94-V0 requirement under the condition that the thickness of the plastic piece is 0.5 mm-0.8 mm.