The invention discloses a novel joint bearing wearing service lifetime testing clamp, and relates to the testing technology field. The novel joint bearing wearing service lifetime testing clamp comprises a mandrel without a keyway, a jig body I, a jig body II, a left supporting bearing, a right supporting bearing, a left lining, a right lining, a left bearing pressing cover, a right bearing pressing cover, a baffle plate, and a nut. The novel joint bearing wearing service lifetime testing clamp is advantageous in that the spindle head and the spindle body of the mandrel are not provided with the keyways, and therefore the intensity and the rigidness can be improved, and the load and the torque can be reduced; the left supporting bearing seat and the right supporting bearing seat are integrated together, and then the assembly and the disassembly are more convenient, the assembly disassembly intensity can be reduced, and the assembly disassembly efficiency can be improved; the inner ring and the outer ring of the left supporting bearing seat and the right supporting bearing seat are provided with axial fixing links, and then the slipping phenomenon of the bearing can be prevented during the high-speed rotation and swinging, and therefore the test fault occurrence probability can be reduced, the stability of the testing jigs and the safety performance of the test can be improved.