The invention discloses a testing device and a testing method for the durability of a tube shear. The testing device for the durability of the tube shear comprises a tube shear clamp, a driving devicefor driving the tube shear to clamp or loosen, a tube conveying device for conveying tubes to the tube shear successively and a controller, wherein the driving device and the tube conveying device are both electrically connected with the controller. The testing method for the durability of the tube clamp comprises the following steps: S10: fixing the tube shear on the tube shear clamp and puttingthe tubes in the tube conveying device; S20: starting testing, and conveying the tubes in the tube shear by the tube conveying device; S30: driving a free handle by the driving device and enabling the tube shear to gradually clamp the tube until the tube is sheared off; S40: driving the free handle by the driving device and enabling the tube shear to loosen; S50: repeating S20 to S40 for severaltimes until preset test times are reached. The testing device and the testing method for the durability of the tube shear, disclosed by the invention, have the advantages that the durability of the tube shear can be automatically tested, so that manual operation can be effectively reduced and the test efficiency is improved.