The invention discloses a spring tensile and bending life testing device and method. The testing device comprises a base. A first supporting plate is vertically disposed at the upper left end of the base; and a mounting bracket connected to the first supporting plate is disposed at the upper right end of the base. A guiding sleeve is arranged at the mounting bracket; a lifting rod is arranged in the guiding sleeve in a sliding fit manner; and side plates arranged at the two sides of the upper end of the lifting rod are connected and fixed with the mounting bracket by second reset springs. A limiting assembly is arranged between the lifting rod and the guiding sleeve to limit the relative rotation of the lifting rod and the guiding sleeve. A rotating disk is arranged at the upper end of thelifting rod in a rotating manner. According to the invention, defects of the existing device are overcome. With an eccentric adjusting assembly, the normal tensile test of the spring as well as the bending testing of the spring can be completed. Besides, the eccentric adjusting assembly is also capable of adjusting the bending and tensile amplitudes of the spring slightly, thereby overcoming thedefect of only performing the single function testing by the existing device. The spring tensile and bending life testing device and method have high practicability.