The invention discloses a cutting machine, which belongs to the technical field of electric machinery. The cutting machine comprises a rack; the rack is provided with a worktable, a cutting mechanism and an automatic lifting mechanism; the cutting mechanism is arranged above the worktable, and the automatic lifting mechanism and the cutting mechanism are connected by a connecting rod; a lifting cylinder in the automatic lifting mechanism is connected to the cutting mechanism, and after a gas source is opened, the lifting cylinder drives the cutting mechanism to move downwards along a first supporting rod and a second supporting rod in the automatic lifting mechanism. The worktable is provided with a vertical scaleplate, the automatic lifting mechanism is provided with a camera, the worktable is further provided with a control device, and the camera and a pressure adjusting valve of the lifting cylinder are both electrically connected to the control device; and the control device is further provided with a touch screen for inputting a predetermined cutting depth. The cutting machine not only can effectively control a cutting depth but also greatly reduces vibration of a cutting knife in a working process of the cutting machine, and a cutting precision is improved.