The utility model discloses a power voltage regulating point switching circuit of a carrier rocket control system. The power voltage regulating point switching circuit comprises relays K1 and K2, a resistor R1, diodes V1, V2, V3 and V4, a button switch S1 and a voltage regulating circuit, wherein one end of the button switch S1 is connected with a power supply positive bus, and the other end of the button switch S1 is connected with a power supply negative bus through a line of the relay K1 and is meanwhile connected to the power supply negative bus through a group of normally open contacts of the relay K1, which are connected together in series, and a line of the relay K2; one end of the resistor R1 is connected with the power supply positive bus, and the other end of the resistor R1 is connected with a positive end of a load through another group of normally open contacts of the relay K1; an output positive end of the voltage regulating circuit for regulating power output voltage is connected to the power supply positive bus through a group of contacts of the relay K2, and an output negative end of the voltage regulating circuit is connected to the power supply negative bus through another group of contacts of the relay K2; and the diodes V1, V2, V3 and V4 are connected in series and are then connected between the positive end of the load and the positive end of the voltage regulating circuit.