The present invention provides a synchronous rectification converter circuit, including three transformer secondary inductors, a current transformer, a controller, three groups of diodes, and a resistor, where the current transformer includes three primary inductors and three secondary inductors; the three groups of diodes are connected in parallel at two ends of the resistor; the three transformer secondary inductors and the three primary inductors are alternately connected in series to form a first triangular structure; three vertices of the first triangular structure are respectively connected to switch components in a synchronous rectification circuit; the three secondary inductors are connected in series to form a second triangular structure; three vertices of the second triangular structure are respectively connected to the three groups of diodes; an end that is connected to a corresponding node and of each secondary inductor has a same polarity as an end that is connected to a corresponding node and of a corresponding transformer secondary inductor; and the controller controls the on-off state of a switch component by sampling a voltage of a diode. The present invention achieves a purpose of precisely controlling the on-off state of the synchronous rectification circuit.