The invention discloses a generation method and a device of an intermediate infrared femtosecond laser pulse with self-stabilized carrier phase. The method comprises the following steps in particular:adopting a bundle of femtosecond laser pulse with wide spectrum as a driving source; utilizing a concave silver mirror to ensure that the laser focuses on a nonlinear crystal after being emitted in asmall angle after dispersion compensation is carried out by a plurality of chirp mirrors and a pair of wedges; and allowing the laser after a difference frequency effect to pass an infrared closure light filter to obtain the intermediate infrared femtosecond laser pulse with self-stabilized carrier phase. The invention provides a generation device of the intermediate infrared femtosecond laser pulse, comprising a dispersion compensation system, the concave silver mirror, nonlinear crystals and an infrared light filter, wherein, the dispersion compensation system comprises a plurality of chirpmirrors and the pair of wedges. The device and the method in the invention is characterized by simple principle, compact device, stable running and the like; the generated carrier phase of the intermediate infrared femtosecond laser pulse is self-stable; and the laser serving as a seed source is an ideal driving laser source to generate the attosecond pulses after parametric amplification.