The invention discloses a wireless communication apparatus frequency synthesizer consisting of two low frequency circuits, two frequency hopping circuits, one high and intermediate frequency circuit and a control circuit, wherein, each frequency hopping circuit consists of a DDS device A, a phase-locked loop unit A and a filtering unit A, the high and intermediate circuit consists of a DDS device B, a phase-locked unit B and a filtering unit B, each low frequency circuit consists of a DDS device C and a filtering unit C, and the control circuit consists of a CPLD controller and a clock source. The wireless communication apparatus frequency synthesizer has the following beneficial effects: as to the frequency hopping, a solution of frequency synthesis is realized by a directive activation of PLL by DDS, and as to the low frequency, a DDS direct production manner is adopted, flexibility and transferability of software radio are sufficiently reflected, the frequency synthesizer possesses fast locking time, and ensures small stray, correct frequency accuracy, low phase noise, excellent spectral purity and wide range of frequency hopping, and reaches high technical index.