The present invention provides a novel interleaved boost soft-switch circuit. The circuit comprises a boost circuit and a soft-switch circuit connected with the boost circuit. A third diode is additionally connected in series to the inside of a branch of a resonant circuit composed of a resonant inductor, a first diode and a second diode in the soft-switch circuit, and a voltage drop of the branch is increased, so that under the same current condition, the voltage drop in the branch of the resonant circuit is greater than a voltage drop in a branch of a master diode connected in parallel with the branch of the resonant circuit, and thus, a current can flow mainly through the branch of the master diode in the boost circuit and the current flowing through the branch of the resonant circuit is decreased relatively; and furthermore, the problems of larger loss of the soft-switch circuit and overheating of a resonant inductor, which are caused by use of a sic diode in a conventional soft-switch + boost circuit, are solved.