The invention belongs to the technical field of electrical devices and particularly relates to a wiring device for grounding grid characteristic parameter testing. The wiring device comprises an unwinding trolley, a winding device and a counting device. The winding device and the counting device are connected to the unwinding trolley. According to the wiring device, a winding disk is placed on the unwinding trolley, the unwinding trolley can be pushed to complete wiring in the wiring process of a test, and workloads of the manner that unwinding is traditionally performed through a manual wire lifting wheel shaft are relieved. Besides, a new winding disk can be replaced for the unwinding trolley by opening an auxiliary frame, a testing wire which is too large in weight does not need to be pushed at a time, and therefore work intensity is greatly reduced. Meanwhile, the wiring device can overcome the defects of an existing method that length is estimated through the footstep number, greatly improves accuracy of test data and reduces the work intensity caused when winding is performed in a hand-cranking manner in the prior art to the maximum extent.