The invention discloses a multi-core ultra high-speed flat type elevator cable testing device in the technical field of cable testing equipment. The device comprises a machine body, wherein the top ofthe machine body is fixedly provided with a driving air cylinder; the right side output shaft of the driving air cylinder is connected with one end of a cable through a stationary fixture; a tensionsensor is fixedly installed on the inner cavity wall of a detection device; the top of the machine body is also fixedly provided with an installation frame; the top rod of the installation frame is sheathed with a line winding wheel; a connection line wound on the line winding wheel is connected with the cable; the left side and the right side of the line winding wheel are symmetrically provided with two groups of sliding rods; and the bottom of each sliding rod is provided with a measurement clamping jaw. By use of the device, after two ends of a cable to be detected are fixed through the stationary fixture and a fixing block, the air cylinder is started to stretch the cable, and the tensile strength of the cable is obtained. The device can carry out measurement detection by aiming at thetensile strength and the anti-bending degree of the cable, and has the advantages of being high in practical value and convenient in measurement detection.