The utility model discloses a disassembly and assembly tool for a tachymeter spring. The disassembly and assembly tool comprises a hand vise and an insertion strip which can be matched with the hand vise to eject a connecting pin out. Wherein the hand vise comprises a first vise arm, a second vise arm, handle ends arranged on the first vise arm and the second vise arm, and a hinge end for hingingthe first vise arm and the second vise arm, and a plurality of functional parts are arranged between the handle ends and the hinge end; the function part comprises a first dismounting part used for dismounting a connecting pin, and the first dismounting part comprises a first groove formed in the first clamp arm, a first protruding block arranged on the second clamp arm and an inserting hole formed in the second clamp arm and used for allowing the inserting strip to be inserted. The disassembling and assembling tool can be used for conveniently disassembling and assembling the spring, so thatthe working efficiency and safety of disassembling and assembling can be improved, and the speedometer can be prevented from being damaged.