High-precision power supply circuit for testing electronic equipment

The invention discloses a high-precision power supply circuit for electronic equipment testing, which is applied to an electronic equipment testing system, and comprises a voltage reduction module, a linear regulation loop module and an electronic load loop module, the voltage reduction module is used for converting an input 12V power supply into a first output voltage in a preset range under the control of a received first feedback signal, the linear regulation loop module and the electronic load loop module are connected to an output line of the voltage reduction module, and the linear regulation loop module is used for carrying out linear fixed-difference voltage reduction on the first output voltage under the action of a second feedback signal to obtain second output voltage; and the electronic load loop module is used for simulating charging and discharging of the electronic equipment under the action of the third feedback signal. The characteristics of the step-down regulator and the P-type MOS tube are