The invention discloses a piston rod and a manufacturing method thereof, and relates to a piston rod anti-corrosion technology. The piston rod and the manufacturing method thereof have the advantages that the service life of the piston rod can be prolonged. The piston rod comprises a piston rod base body and a stainless steel cylinder sleeve, wherein the stainless steel cylinder sleeve tightly wraps the piston rod base body. The manufacturing method comprises the steps that a stainless steel plate is cut; the stainless steel plate is coiled into a cylinder shape, and butt joint seams is welded so as to manufacture the stainless steel plate into the stainless steel cylinder sleeve; the stainless steel cylinder sleeve is sleeved outside the piston rod base body; the stainless steel cylinder sleeve is stretched to wrap the piston rod base body; the parts, extending outside, of the two ends of a stainless steel cylinder are turned; an annular seam formed by the two ends, wrapped by the stainless steel cylinder sleeve, of the piston rod base body is welded, and the piston rod coated with the stainless steel cylinder sleeve is manufactured; stress relief heat treatment is carried our on the piston rod coated with the stainless steel cylinder sleeve; and the piston rod coated with the stainless steel cylinder sleeve is subjected to polishing treatment. The piston rod and the manufacturing method thereof are suitable for corrosion prevention of the piston rod.