The forming and expanding of cracks in high strength aluminum alloy self-piercing riveting process were studied，the forming simulation model of self-piercing riveting process was established，the forming and expanding of cracks in high strength aluminum alloy self-piercing riveting joint forming process was analyzed，and the self-piercing riveting process was verified by experiments.The results show that the stamping speed has an obvious influence on the structure and strength of the mechanical inner lock of 7075 aluminum alloy self-piercing riveting joint.With the increase of punching speed，the crack at the joint turns from crack to gap，and the mechanical inner lock size and strength of the joint decrease respectively.The punching speed is positively related to the equivalent plastic strain rate of the sheet.The equivalent plastic strain rate of sheet increases with the increase of punching speed，the lower sheet is more prone to crack and the damage of joint is more serious；For the self-piercing riveting of low ductility aluminum alloy materials，the punching speed shall be reduced to improve the forming quality of self-piercing riveting joints.