The invention discloses a phase shifting angle feedforward-based LLC sensorless synchronous rectification control method. Accurate synchronous rectification is realized through an optimizing algorithmaccording to a relation between switching frequency and a phase shifting angle in synchronous rectification driving and mixed control when the same setting voltage is reached; and by introducing phase shifting angle feedforward control, the problem of control lag of the optimizing algorithm caused by response lagging property of the output voltage is solved. By virtue of the control method disclosed in the invention, synchronous rectification is realized without increasing the system hardware cost, so that the LLC resonant converter efficiency is further improved; and through phase shifting angle feedforward control, the problem of control lag of the optimizing algorithm is solved, so that ring current generation of a primary side of a transformer in power supply and load sudden change can be avoided, thereby avoiding influence to safety operation of the system.