The invention provides a disconnectable busbar joint device of a rigid contact network, which belongs to the technical field of rail traffic and solves the technical problems that the conventional rigid contact network system is time-consuming and labor-consuming in operation, has low safety performance and the like when a flood gate or a civil air defense gate is required to be closed. The disconnectable busbar joint device of the rigid contact network comprises a busbar end A, a busbar end B and a connecting section between the busbar end A and the busbar end B, wherein the busbar end A and the busbar end B are connected with two ends of the connecting section respectively through a sliding busbar joint; the sliding busbar joint comprises a power supply arm bracket, a static joint and a moveable joint; the static joint is fixed on the power supply arm bracket; the moveable joint is arranged in the power supply arm bracket and can slide along the power supply arm bracket; the moveable joint is sleeved at the two ends of the connecting section respectively; the static joint is fixedly connected with the busbar end A and the busbar end B respectively; and a linkage device is arranged on the moveable joint. The disconnectable busbar joint device of the rigid contact network has the advantages of simplicity/labor saving in operation, safety in use and the like.