The invention provides a high-efficiency low-dropout regulator, which comprises: an output voltage regulating circuit that includes a voltage follower circuit for regulating an output voltage to be equal to an input reference voltage; a positive feedback circuit with the stability independent of a load capacitance and a load current and the loop gain being lower than 1, and a gain attenuation circuit that ensures the loop gain to be lower than 1; a lowest load current providing circuit used for providing a load current when the load is zero; an output load current limiting circuit used for overcurrent protection, and when the output load current exceeds a set threshold value, the circuit is turned off in time; an input current eliminating circuit used for providing a voltage stabilizing structure with infinite input impedance; and meanwhile, a bias current is adapted to the output load current, so that the circuit energy efficiency is improved.