A manufacturing method for a battery is provided in the present invention. The manufacturing method includes the steps of: S1 rolling up a positive-electrode structure by a carbon rod; S2 rolling up a separation structure; S3 rolling up a negative-electrode structure; and S4 inserting the carbon rod with the positive-electrode structure, the separation structure and the negative-electrode structure into a paper tube. At least one of the positive-electrode structure and the negative-electrode structure contains chlorophyll. Thus not only is the manufacturing method of the battery simple, and economical, but also natural, non-toxic substances are employed, unlike the conventional batteries, the battery of the present invention will not cause environmental pollution even when discarding after being used.