The invention provides a continuous punching device of a steel belt. The continuous punching device can solve the technical problem that a conventional punching device is long in processing time and low in production efficiency. The continuous punching device comprises a stamping mechanism and a control mechanism, and is characterized in that the continuous punching device further comprises a supporting mechanism, a conveying mechanism and a levelling mechanism which are sequentially arranged in the feeding direction, wherein the conveying mechanism comprises a conveying machine base, guide rails, a stepping motor and a tensioning cylinder; the guide rails comprise an output end guide rail and an input end guide rail; the stepping motor is fixed to the back side wall of the conveying machine base; a driving wheel is connected on an output shaft of the stepping motor; the tensioning cylinder is fixed to the top wall of the conveying machine base; a piston rod of the tensioning cylinder drives a rotatably arranged driven wheel to move up and down; the levelling mechanism comprises a levelling support and elastic roller assemblies arranged above the output end guide rail; the levelling support is fixed to the left side wall of the conveying machine base; the elastic roller assemblies comprise longitudinal supporting rods, roller seats, springs and rollers; and the longitudinal supporting rods are connected with the levelling support in a sliding manner and can move in the up-down direction.