The invention belongs to the technical field of surgical operations, and particularly relates to an automatic incision electric saw for an orthopedic operation. The automatic incision electric saw is characterized by comprising a bone saw body, moving blocks, a sliding frame and brackets, wherein the bone saw body is positioned below the sliding frame; a center shaft of the bone saw body is connected with a connecting rod; the connecting rod is fixedly connected with the sliding frame; the sliding frame is fixedly connected with a cylinder through a first fixing frame; two ends of the sliding frame are fixedly connected with the moving blocks; a laser ranging sensor is arranged on one side of the sliding frame; the cylinder is fixedly connected with a cross rod through a second fixing frame; two ends of the cross rod are transversely supported on the brackets; moving block bedside fixing grooves are formed in the side parts of the brackets; the moving blocks are positioned in the moving block bedside fixing grooves; fixed blocks are arranged at the bottom ends of the brackets, and are fixedly connected with the bottom ends of the brackets. The automatic incision electric saw has the beneficial effects that a bone sawing process can be automatically implemented, and bone sawing depth can be accurately controlled, so that an operation is effectively prevented from failing, and the pain of a patient is alleviated.