In order to realize the measurement of lidar echo peak, a peak detection and quantization circuit of echo used in lidar receiver is introduced. It uses the method of echo pulse voltage sampling and holding to keep cooperation with low speed ADC (Analog to Digital Converter) to achieve the high precision quantitation of echo peak. The circuit adopts SMIC 0.18 μm process design. The simulation results show that the dynamic range of sampling voltage is 800 mV, and the error of pulse holding voltage of sampling 3 ns pulse width is less than 3.16%. The quantization precision of 10 bit is realized. The whole circuit sampling period is controlled by external enabling signal and reset signal, which can meet the application requirements of lidar receiver echo peak sampling under different occasions.