The present invention discloses a switching control circuit of the low dropout regulator LDO which is integrated in a circuit module that a main circuit is provided. The switching circuit comprises the following components: a trigger which outputs a low level triggering signal to the LDO when a reset low-level signal transmitted by a reset module is received, and outputs a high level triggering signal to the LDO when a jump edge of the signal outputted by the control module is received; the LDO which is actuated when the low-level triggering signal outputted by the trigger is received and provides a stabilizing voltage obtained by converting the power voltage to the control module, and is switched off when the high-level triggering signal outputted by the trigger is received; and a control module which outputs the signal when the stabilizing signal provided by the LDO is received, and jumps the output signal when the LDO needs to be switched off. When the invention is applied, the LDOcan be simply switched off without adding a pin specialized for switching off the LDO to the processing chip when the LDO is provided at the inner part of the processing chip.