Based on TSMC 65 nm CMOS technology, in this study, a double-clamp counting circuit is designed for a high-precision current matching charge pump circuit in a wide voltage range. The double-clamp technology avoids the complicated circuit structure caused by the rail-to-rail operation amplifier. Moreover, the influence of non-rational effects, such as charge sharing, clock feedthrough, and charge injection, on the circuit are effectively optimized by adding the count of the regulating switch tube and the complementary switch. The simulation results show that, compared with the traditional charge pump circuit, when the power supply voltage is 1.2 V and the charge pump current is 50 μA, the power supply voltage is 1.2 V. The current matching degree of the double-clamp charge pump circuit can be maintained within 0.03% in the range of 0.2~1.0 V.