The present disclosure provides a laser processing apparatus. A laser processing apparatus includes a laser generator, a laser amplifier, a chromatic dispersion tuner and an optical focusing unit. The laser generator is configured to generate ultrashort pulse laser having chirp characteristics by simultaneously generating a plurality of wavelengths. The laser amplifier is configured to amplify the laser generated by the laser generator. The chromatic dispersion tuner is configured to adjust chirp and pulse width of the laser output from the laser amplifier. The optical focusing unit is configured to irradiate a workpiece with the laser after adjusting the depth of focus of the laser with the chirp and the pulse width adjusted by the chromatic dispersion tuner.