The invention relates to a starting circuit and discloses a starting circuit for a reference source. The starting circuit comprises an inverting unit, a starting unit, a biasing unit and an enabling unit. Enabling signals are input to the inverting unit, the inverting unit provides signals for the starting unit and the enabling unit, the enabling signals are changed to perform zero clearing on the starting signals, and an enabling circuit is closed to change the output bias of the biasing unit, so that the reference source and other circuit modules of a chip are enabled. After the reference source and other circuit modules of the chip work normally, the signals are fed back to the starting circuit to enable the starting circuit to stop working, so that the power consumption is low. The circuit has the advantages of being rapid, low in power consumption and capable of being enabled.