The invention discloses a portable SF6 infrared leak detector verification gas generation device and a portable SF6 infrared leak detector verification gas generation method and aims to solve the problem that the SF6 gas leakage amount cannot be accurately controlled in sensitivity verification of an SF6 infrared leak detector. The outer side end of a piston rod (5) of a gas cylinder (4) is fixedly connected with a screw nut (3); a gas inlet tube (6) and a gas outlet tube (9) are respectively connected with the front end of the gas cylinder; the other end of the gas inlet tube (6) is communicated with an SF6 gas cylinder (7); an electric control gas inlet switch valve (8), a gas inlet pressure sensor (14), an electric gas outlet switch valve (10) and a gas outlet pressure sensor (13) are respectively electrically connected with a verification electric controller (15); a stepper motor drive (19) is connected onto the verification electric controller (15); the stepper motor drive (19) iselectrically connected with a stepper motor (18); and an SF6 infrared leak detector background plate (12) is arranged on one side of a gas outlet (11) of the gas outlet tube. The device is capable ofprecisely controlling the leaking amount of an SF6 gas and is low in cost and high in accuracy.