Tumor radiotherapy positioning and developing marking pen

The invention discloses a tumor radiotherapy positioning and developing marking pen. The marking pen comprises a marking pen body; the pen point is in threaded connection with the threaded hole in the bottom of the marking pen body through a hollow screw at the top; the pen tube is inserted into the inner wall of the pen point and the inner wall of the marking pen body, and a round hole through which the pen point part of the pen tube can penetrate is formed in the bottom of the pen point; the marking pen comprises a marking pen body, two operating rods and an alignment guide structure, the two operating rods are symmetrically mounted on the two sides of the marking pen body, the alignment guide structure is mounted on one side of the marking pen body, when the marking pen body is used for drawing, drawing can be more accurate through guide assistance, and under the cooperation effect of the guide structure, the marking pen body can be conveniently used for drawing. The device can be linked with a wiping and