A DC-DC power supply control circuit, comprising: a voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a first triode and a second triode; wherein an end of the first resistor is connected with an input end of the DC-DC power supply, and another end of the first resistor is connected with an enable end of the DC-DC power supply; an end of the second resistor is connected with the enable end of the DC-DC power supply, and another end of the second resistor is connected with a collector of the second triode; a base electrode of the second triode is connected with a collector of the first triode, and an emitting electrode of the second triode is grounded; a negative electrode end of the voltage stabilizing diode is connected with an output end of the DC-DC power supply, and a positive electrode end of the voltage stabilizing diode is connected with a base electrode of the first triode; an end of the third resistor is connected with the base electrode of the first triode, and another end of the third resistor is grounded; an emitting electrode of the first triode is grounded; and resistance values of the first resistor and the second resistor meet following conditions: V i ⁢ n min ∗ R 2 R 1 + R 2 ≤ V en; and V innormal ∗ R 2 R 1 + R 2 ≥ V en; wherein V in min denotes a minimum working voltage of the DC-DC power supply, V innormal denotes a normal working voltage of the DC-DC power supply, V en denotes a turn-on voltage of the enable end of the DC-DC power supply, R 1 denotes a resistance value of the first resistor, and R 2 denotes a resistance value of the second resistor. a voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a first triode and a second triode; wherein an end of the first resistor is connected with an input end of the DC-DC power supply, and another end of the first resistor is connected with an enable end of the DC-DC power supply; an end of the second resistor is connected with the enable end of the DC-DC power supply, and another end of the second resistor is connected with a collector of the second triode; a base electrode of the second triode is connected with a collector of the first triode, and an emitting electrode of the second triode is grounded; a negative electrode end of the voltage stabilizing diode is connected with an output end of the DC-DC power supply, and a positive electrode end of the voltage stabilizing diode is connected with a base electrode of the first triode; an end of the third resistor is connected with the base electrode of the first triode, and another end of the third resistor is grounded; an emitting electrode of the first triode is grounded; and resistance values of the first resistor and the second resistor meet following conditions: V i ⁢ n min ∗ R 2 R 1 + R 2 ≤ V en; and V innormal ∗ R 2 R 1 + R 2 ≥ V en; wherein V in min denotes a minimum working voltage of the DC-DC power supply, V innormal denotes a normal working voltage of the DC-DC power supply, V en denotes a turn-on voltage of the enable end of the DC-DC power supply, R 1 denotes a resistance value of the first resistor, and R 2 denotes a resistance value of the second resistor.