The invention discloses an induction heating power circuit which belongs to electric product field. The induction heating power circuit is composed of a main-control part and a power part. The main-control part comprises switch electrical source and drive part, oscillation excitation part, phase and voltage locking, load too-small detection, load too-large detection, voltage limitation protection, current limitation protection, soft start part, temperature protection part; the power part comprises sensor and core part composed of full bridge power tube. The induction heating power circuit uses four wire three phase output method, the heating electrical source operation is in safe and high-efficient method by processing reactive power compensation and harmonic management through reactor after rectification, accordingly, various hidden dangers of traditional resistance wire heating method is avoided. The induction heating power circuit can be wide used in plastic film blower, wire drawing machine, injection molding machine, granulator, rubber extruder, curing press, cable extruder, petroleum heating and bathroom heating in daily life etc.