The invention discloses a welding base realizing quick replacement of the surface. The welding base comprises a bottom mold body; the outer contour of the bottom mold body is a straight column body; the welding base further comprises a cushion board, a cushion board base and a side baffle; the cushion board is arranged below the bottom mold body in a manner of making contact with the bottom mold body; the side baffle is arranged at one side of the end face of the bottom mold body; the cushion board is detachably connected with the cushion board base and/or the side baffle; the bottom mold bodyis provided with a center through hole; the opening of the center through hole is positioned in the end face of the bottom mold body; a connecting part penetrates into the center through hole; and the bottom mold body is detachably and fixedly connected with the side baffle through the connecting part. The welding base realizing quick replacement of the surface is reasonable in structure; a cushion is arranged at the bottom of the bottom mold body; the cushion board is detachably connected with the cushion board base; when the surface of the bottom mold body is abraded due to long-time welding, the cushion is taken out; and the bottom mold body is rotated about a screw by loosening the screw so as to replacing the surface of the bottom mold body. The invention further discloses a weldingdevice which comprises the welding base realizing quick replacement of the surface.