The invention discloses a two-transistor forward converter with dual RCD clamping circuits, and belongs to the technical field of a DC-DC converter. The drain electrode of a switch tube M1 is connected with the positive electrode of a power supply Vs; the source electrode of the M1 is connected with the non-dotted terminal of a T1 first secondary-side winding, and the dotted terminal of a T2 primary-side winding; the gate electrode of the M1 is connected with the dotted terminal of the T1 first secondary-side winding; the source electrode of an M2 is connected with the negative electrode of the Vs and the non-dotted terminal of a T1 second secondary-side winding; the drain electrode of the M2 is connected with the non-dotted terminal of the T2 primary-side winding; the gate electrode of the M2 is connected with the dotted terminal of the T1 second secondary-side winding; one RCD clamping circuit is positioned between the connection points of the drain electrode of the M1 and the non-dotted terminal of the T2 primary-side winding; the other RCD clamping circuit is positioned between the connection points of the source electrode of the M2 and the dotted terminal of the T2 primary-side winding; and the secondary-side winding of the T2 is connected with a rectifying circuit. The two-transistor forward converter adopts the dual RCD clamping circuits, so that it is ensured that the input can change within a relatively wide range; and particularly, the duty ratio can be further improved under low input and heavy load so as to realize stable output.