The invention discloses a vertical numerical control gear lathe. The vertical numerical control gear lathe comprises a machine base. A gear machining platform is arranged on the machine base. The gearmachining platform comprises a support, a first rotating mechanism and a rotary platform used for clamping and carrying gears to be machined. The rotary platform is arranged above the support. The first rotating mechanism is arranged in the support and connected to the bottom of the rotary platform and can drive the rotary platform to rotate relative to the support. One side of the gear machiningplatform is connected with a stand column through a guide rail. The other side of the gear machining platform is fixedly provided with a cutting tool grinding device. The stand column can move closeto or far from the gear machining platform along the guide rail through a first lead screw nut pair. The side, close to the gear machining platform, of the stand column is provided with a tool rest device. The tool rest device is connected with the stand column through a sliding platform. The vertical numerical control gear lathe provide by the invention can conduct machining on gears automatically, can grind the cutting tools at any time and has the characteristics of being reasonable in structure, good in gear machining effect, capable of saving cost and the like.