The invention discloses a laser millimeter wave integrated ranging and speed measuring radar method. Modulated optical signals are filtered to generate broadband linear frequency modulation laser signals and broadband linear frequency modulation millimeter wave signals in two channels respectively. The laser signals are divided into laser local oscillation signals and laser emission signals, the laser emission signals are emitted, laser echo signals are received, coherent light mixing is carried out on the laser echo signals and the laser local oscillation signals, and laser channel ranging and speed measuring data are obtained through filtering, analog-to-digital conversion and Fourier transform; the millimeter wave signals are divided into millimeter wave local oscillation signals and millimeter wave emission signals, the millimeter wave emission signals are emitted, millimeter wave echo signal are received, frequency mixing coherent reception is performed on the millimeter wave echosignals and the millimeter wave local oscillator signals, and Fourier transform is used to obtain millimeter wave channel ranging and speed measuring data. Finally, the data of the two channels are fused. According to the invention, the structure is compact, the compatibility is higher, more complex environment can be adapted to, the sweep frequency bandwidth and the repetition frequency can be greatly improved, and bandwidth setting is freer.