Follow-up three-rail current collector

The utility model discloses a follow-up three-rail current collector, and belongs to the technical field of third-rail current collectors for rail transit vehicles. The three-rail current collector comprises a machine frame and a current collection sliding plate in contact with three rails, a supporting arm structure capable of being stretched or folded is arranged between the machine frame and the current collection sliding plate, and the two ends of the supporting arm structure are rotationally connected with the machine frame and the current collection sliding plate through connecting pieces respectively, so that when the supporting arm structure is stretched or folded, the supporting arm structure can be folded or unfolded. The utility model has the beneficial effects that the following performance between the current collection sliding plate and the three rails is good, the contact area is large, the resistance is small, the temperature rise effect is low, the abrasion of the current collection sliding p