With the continuous increase of train speed, undulations of catenary and vibrations of the pantograph head result in generating pantograph-catenary arc frequently, intensifying the abrasion between pantograph strip and catenary wire, which has seriously influenced the current collection and safety of electric multi units (EMU). It is necessary to study the pantograph-catenary arc in immediately. Some researchers develop a few pantograph- catenary arc testing equipment, which couldn’t really reflect the operating condition of pantograph-catenary system. In this paper, the pantograph-catenary arc test apparatus was developed, which simulated the flexible and straight contact of pantograph strip and catenary wire, based on the coupling relationship between pantograph and catenary. The equipment was used to research the electrical parameters of the pantograph-catenary arc and the dynamic contact resistance.