The invention discloses a PFC and LLC resonance-based intelligent half-bridge modified wave voltage conversion circuit, which comprises an input unit, a filter unit, a PFC booster unit, an LLC isolation converter unit and an inverse inverter unit, wherein the LLC isolation converter unit comprises a first switch tube, a second switch tube, a transformer, a first diode, a second diode and a filter inductor; a source of the first switch tubeis connected to a first end of a primary winding of the transformer; a second end of the primary winding of the transformer is connected to front-end ground through a first resonant capacitor; a drain of the second switch tube is connected to the first end of the primary winding of the transformer; the first end of a secondary winding of the transformer is connected to a cathode of the first diode; the second end of the secondary winding of the transformer is connected to an anode of the second diode; and the cathode of the second diode is connected to the front end of the filter inductor. According to the PFC and LLC resonance-based intelligent half-bridge modified wave voltage conversion circuit, the PF value and the quality of output voltage can be improved.