Steel seal is a seal made of steel plate engraved with two seals: upper and lower yin and yang. Usually covered on special documents or photos, there is no color, only raised words, numbers and icons. In iron and steel enterprises, it is used to mark finished plates or bars. Generally, it consists of ten Arabic numerals from 0 to 9. Most of them are made of special tool steel or hard alloy steel through special heat treatment process. There are two kinds of steel printing machines: manual and electric. Manual stamp printing machine has high labor intensity and low efficiency, which is unbearable for operators; Electric stamp printing machine is mainly composed of motor, reducer and cam mechanism. This product is bulky, noisy, time-consuming and laborious to operate, consumes a lot of electricity and is often blocked. The automatic single chip microcomputer steel printing machine completely solved the above problems. It is an updated product of electric steel printing machine and the most advanced product in the field of steel printing machine. The power of the single chip microcomputer stamping machine comes from the motor, and its working principle is that the single chip microcomputer controls the motor to drive the traction rod and the seal to reciprocate, so as to achieve the purpose of stamping.