The invention discloses a valve base sealing ring belt punching forming method. The method comprises the following steps that a, during boring, a chamfer is machined on a hole port (3) of a to-be-punched hole (2) of a valve base (1); b, a spherical punching head (4) is arranged on a pneumatic press machine main shaft (5), a lever indicator (6) is used for detecting the attached end face of the spherical punching head (4) and the press machine main shaft (5), and zero point alignment is conducted; c, the valve base (1) is arranged in a punching clamp base (7) and arranged on a press machine work face, the hole port (3) is aligned with the spherical punching head (4), then the lever indicator (6) is used for detecting surface bounce of the valve base (1), and it is guaranteed that the end face of the valve base (1) is flatly placed; and d, a hard alloy punching tool (9) with a front guider (8) is vertically placed in the to-be-punched hole (2), then, a press machine is started to punch the hole port (3), and a valve base sealing ring belt is formed. According to the valve base sealing ring belt punching forming method, the valve base sealing ring belt surface hardness and strength are improved, and the service life of the valve base is prolonged.