The invention discloses a low temperature coefficient complementary metal oxide semiconductor (CMOS) band-gap reference circuit of an output belt low drop-out linear voltage regulator. The band-gap reference circuit comprises a start-up circuit module, a band-gap reference module, a clamping operational amplifier and an output driving module based on low drop-out (LDO), wherein an output end of the start-up circuit module is connected with an input end of the band-gap reference module; an output end of the band-gap reference module is connected with an input end of the output driving module; and an output end of the output driving module is used for outputting needed band-gap reference voltage. The low drop-out linear voltage regulator is taken as an output buffer stage by the band-gap reference circuit, so that the requirement of high driving capability is met, and lower voltage output can be obtained.