The invention discloses a peak value and over-peak moment tracking detection circuit which comprises a voltage comparator, a noninverting amplifier, a sampling retention circuit and a driving circuit, wherein the sampling retention circuit comprises a resistor, a voltage follower, a controlled switch and a retention circuit; the voltage follower follows voltage of the retention circuit, namely output voltage of the voltage follower is equal to that of the retention circuit; the voltage comparator compares an output voltage signal of the noninverting amplifier with a voltage signal Uin input by a tracking detection circuit; a comparison result is output through the voltage comparator to control the driving circuit; the driving circuit controls turning on or turning off of the controlled switch. The circuit directly detects and compares a voltage value of the voltage signal Uin instead of processing a waveform of the voltage signal Uin, so that the circuit is in no relation to the waveform of the voltage signal Uin; therefore, introduction of a nonlinear circuit such as a differential circuit is avoided, and the precision and the reliability of the tracking detection circuit are improved.