Abstract: Because the frequency of the welding with the electromagnetic hammer device was low with only 1 to 3 Hz and it can not meet the production requirements, hammering system of double electromagnet mechanism was developed. Double electromagnetic hammer device was designed based on electromagnetic theory. Using MCU (micro controller unit) AT89C52 as controlling core, the circuit, the keyboard input and display circuit of high frequency control were designed, and the program was debugged. The experiment results showed that high frequency hamming of the hammer mechanism from 6 to 8 Hz was realized. Compared with the control group, when hammering frequency was 3 Hz, the visual area of widmanstatten structure was 23.9% of the control group, but crystal was still bigger and the improvement of organizational performance was not obvious; when the frequency was 7 Hz, the visual area of widmanstatten structure was 3.8% of the control group, it was obviously to be refined and had fine grain, and mechanical properties, plasticity and toughness obviously was improved.