The invention relates to an electric grass mower with an illuminating device, which comprises a handle, a drive control system, a fixed shear blade, a driven shear blade and wheels. The electric grass mower is characterized in that the handle is lengthened and is inclined to the ground, the operating end is provided with a handrail, and the grounding end is provided with the fixed shear blade; the bottom of the fixed shear blade is provided with a front drive wheel; the fixed shear blade is inclined rightwards by 30-45 degrees according to the direction of the handle; a drive control system box is arranged at the junction of the handle and the fixed shear blade; a battery, a drive motor and a controller are mounted in the drive control system box; one end of the fixed shear blade close to the handle is provided with a bearing which is connected with the driven shear blade; the driven shear blade is provided with a rotation drive wheel; the driven shear blade is provided with an elastic buffer device; the drive motor respectively drives the front drive wheel and the rotation drive wheel under the control of the controller; the handrail end of the handle is provided with a switch; the fixed shear blade is provided with a lifting device; the lifting device is provided with a clutch, and a switch of the clutch is arranged on the handrail; the handle is provided with a shield; the handle is provided with a storage bin; the fixed shear blade is provided with a water storage bin; the water storage bin is provided with a spray head; the fixed shear blade is provided with a magnet; and the handle is provided with an illuminating lamp. The electric grass mower is mainly used for mowing grass regions having different characteristics, especially crop growth regions and heavy weed growth regions; and the electric grass mower has strong power and high-quality effect.