To provide an equipment and a method for joining a metallic strip in which a sound joining part is stably obtained.

A rotary shear having two pairs of upper and lower rotary blades, a grinding equipment provided with a pair of rotary grinding wheels 31a-31d for grinding a tail end part of a preceding metallic strip and for grinding a forward end part of a succeeding metallic strip which are arranged in an independently reducing and driving manner, and an electrode ring to press and energize the metallic strip are provided, the parts at the grinding position on the inner side of the metallic strip from the respective deepest recessed part of the tail end part of the preceding metallic strip 11a and the forward end part of the succeeding metallic strip are ground in the width direction, and cut within the ground part, the tail end part is overlapped with the forward end part, and pressing and energizing are performed to join the strips by welding.