On-resistance testing device

The invention relates to an on-resistance testing device, including a rack, a driving part, a lower test module and an upper test module. The lower test module includes a lower mounting plate group, afloating plate and a lower probe, the lower mounting plate group is arranged on the rack, the floating plate can be arranged on the lower mounting plate group in a liftable manner and a station carrying a workpiece is formed on the floating plate, and the lower probe is fixed on the lower mounting plate group and penetrates through the floating plate in a telescopic manner; the upper test moduleincludes an upper mounting plate group opposite to the lower mounting plate group, an upper probe and a prepressing component, the upper probe and the prepressing component convexly extends out of theupper mounting plate group and faces the surface of the lower mounting plate group, the driving part is connected with the upper mounting plate group, the upper mounting plate group is driven to be close to the lower mounting plate group to fall to enable the upper probe to abut against one side of the workpiece, when the upper mounting plate group falls, the prepressing component presses the floating plate relative to the lower mounting plate to enable the lower probe to extend out of the floating plate to abut against the other side of the workpiece in the station, and on-resistance testingis performed on the upper and lower sides of the workpiece at a time, thereby improving testing efficiency.