Bandgap reference circuit and high-order temperature compensation method

A bandgap reference circuit and a high-order temperature compensation method are disclosed. The bandgap reference circuit includes: a starting circuit, a bias circuit and a high-order compensated bandgap reference voltage generating circuit, where a compensation method of the high-order compensated bandgap reference voltage generating circuit is to perform curvature correction by using a sub-threshold current of a CMOS transistor to obtain a high-order temperature-compensated bandgap reference voltage source circuit. The present circuit has the advantages that a manner not increasing circuit complexity can be adopted for implementation, the accuracy of a bandgap reference source can be greatly improved, and power consumption, chip area and cost are reduced.