The invention discloses a device and method for using 456nm all-solid-state laser pumping Pr:YLF to achieve 639nm laser output. The device is sequentially provided with an optical fiber coupling output semiconductor laser, a first non-spherical lens, a second non-spherical lens, a first planar lens, a first laser crystal, a first planar concave lens, a second planar concave lens, a frequency doubling crystal, a third planar concave lens, a third non-spherical lens, a second planar lens, a second laser crystal and a fourth planar concave lens along a light beam transmission direction. The device has the advantages that the semiconductor end pump Nd:GdVO4 crystal is used to output 912nm laser, 456nm laser is obtained to serve as a pumping source after frequency doubling of the 912nm laser, the 456nm laser is used on the pumping Pr:YLG crystal to obtain 639nm orange light output, the problem of relative shortage of Pr:YLF laser pumping sources is solved, a new pumping source is provided to Pr:YLF lasers, and promotion of the output of other visible-band laser of the Pr:YLF lasers is achieved.