The utility model discloses a tension pay-off test device, which is characterized in that a pay-off tackle is used for guiding a test wire, and the test wire is bent and turned when passing through apay-off tackle wheel groove; the traction device applies traction tension to the test wire, so that the test wire moves at different traction tension and traction speeds; the paying-off tackle and thetraction device can transversely move relatively, and the transverse position between the paying-off tackle and the traction device is adjusted. The transverse positions of the pay-off tackle and thetraction device are adjusted according to the actual terrain; the test wire is paid off at a certain deflection angle; during a test, a set traction tension is applied to a test wire through the traction device; the pay-off traction speed of the test wire is gradually increased; the maximum pay-off traction speed of the test wire at the set deflection angle is obtained within the allowable stressrange of each part of the pay-off system, as long as the maximum pay-off traction speed is not exceeded, the phenomena of system damage and groove jumping can be avoided, and the pay-off traction speed is increased on the premise that the safety of the pay-off system is guaranteed.