The invention relates to the field of integrated circuit design, in particular to an anti-transient-impact leakage protection integrated circuit internal biasing circuit capable of resisting transient high-impulse voltage and current impact. The internal biasing circuit comprises a power supply circuit and a reference biasing circuit. The power supply circuit is composed of a voltage stabilizing diode and a high-voltage transient discharging loop, the voltage in the circuit is gradually increased, when reaching the VD1+VD2+VD3 series breakdown voltage, the voltage continues to be increased, a power tube VN2 starts to be switched on, redundant currents will be discharged through the power tube, and therefore the anti-impact capacity of the circuit is improved. The reference biasing circuit is formed by a constant current device and a current power source composed of VN4, VN5, VN3 and R4 together.