The invention discloses a gem slicer, which structurally comprises a slicing platform, a slicing main engine, a positioning vertical arm, an equipment main body, fixed ground feet and storage cabinets; the number of the arranged fixed ground feet is four, and the four fixed ground feet are evenly arranged at two ends of the bottom part of the equipment main body at an equal distance in a manner ofwelding; and each of two ends of the surface of the equipment main body is provided with the storage cabinet. According to the gem slicer disclosed by the invention, when the slicing main engine is controlled by a control handle of the equipment main body to press down to be ready for slicing, an installed vertical arm elevating mechanism presses down synchronously, and a starter is triggered; adriving mechanism is started; then, a transmission mechanism is driven by a link gear; the bottom part of the installed platform structure is connected with the transmission mechanism in a manner of meshing, so that the power of the transmission mechanism can be obtained; finally, gems on a holding plate are driven to be evenly pushed towards the right, therefore facilitating the slicing main engine to perform slicing. The step of manual pushing is canceled, so that time is shortened, uniformity of gem pushing is guaranteed, slices are prevented from being fractured, and the damage rate is reduced.