The invention discloses a monolithic integration frequency synthesizer based on a VHF (very high frequency) band. The monolithic integration frequency synthesizer based on the VHF band comprises five portions of a module composed of an input interface and a power supply filter circuit 1, an FPGA (field programmable gate array) time sequence control circuit 2, a PLL (phase locking loop) circuit 3, a module composed of a crystal oscillator and an amplification filter circuit 4 and a module composed of a buffer amplification circuit and an output interface 5, wherein the five portions are combined into a whole body. A monolithic integration PLL and VCO circuit is used to form a frequency synthesizer module. A chip is designed to work in a fractional frequency division mode, and a VCO automatic calibration frequency mode is adopted, and therefore frequency can be obtained through quick switching, and good power flatness is achieved in approximately three octaves of a work frequency band. Compared with direct frequency synthesis of a DDS (direct digital synthesizer), spurious phase noise of frequency spectra obtained by using a PLL chip circuit is low. Compared with a VCO circuit composed of discrete elements, the PLL chip circuit is good in temperature characteristic and low in lock losing cycle skipping probability. A monolithic integration PLL and VCO chip is used, and therefore debugging difficulty of the monolithic integration frequency synthesizer based on the VHF band is substantially reduced, the size of the monolithic integration frequency synthesizer based on the VHF band is small, and reliability of the monolithic integration frequency synthesizer based on the VHF band is substantially improved.