Traffic PCB control circuit board variable range online testing device

The invention discloses a traffic PCB control circuit board variable range online testing device which comprises a box body and a bottom cover which are assembled together. A voltage converter board is arranged in the box body, a groove used for installing traffic PCB control circuit boards to be tested is formed in the upper end face of a top plate of the box body, and a plurality of testing contacts corresponding to all power source input points of the traffic PCB control circuit boards to be tested in position are arranged on the bottom face of the groove. A plurality of testing probes corresponding to the testing contacts are arranged on the voltage converter board, the ends, located on the voltage converter board, of the testing probes are welded to the voltage output end of the voltage converter board, and the other ends of the testing probes are controlled to make contact with and separate from the testing contacts through a lifting mechanism arranged in the box body. The traffic PCB control circuit board variable range online testing device is easy to operate, can achieve the high-speed short circuit and open circuit tests of the traffic PCB control circuit boards and enables mass production cost to be more economical.