The invention discloses a disc laser based on three parabolic surfaces, and belongs to the technical field of lasers. The disc laser comprises a pump light source, a pump light collimator, a disc laser crystal, a multi-pump unit and a resonant cavity output unit, wherein the multi-pump unit includes a first parabolic reflecting mirror, a second parabolic reflecting mirror, a third parabolic reflecting mirror, a first correcting mirror and a second correcting mirror, the disc laser crystal is located at the focus of the first parabolic reflecting mirror, the second parabolic reflecting mirror and the third parabolic reflecting mirror are symmetrically place above and below the disc laser crystal, the first correcting mirror and the second correcting mirror are respectively located at the focuses of the second parabolic reflecting mirror and the third parabolic reflecting mirror, and the middle of the first parabolic reflecting mirror is provided with a through hole which is used for constructing a V-shaped laser resonant cavity. The disc laser disclosed by the invention solves an angle restriction problem of constructing the V-shaped cavity while guaranteeing the number of pumps through improving the pump structure, and improves the flexibility of resonant cavity construction while achieving high-power and high-beam quality laser output.