The invention discloses a rail transit metering detection operation device. The device is structurally provided with a transverse frame, a side rail frame, a line and a detection operation instrument, a blocking body is overturned upwards by an angle with the center of a rotating block as a fulcrum, the telescopic property of a telescopic frame facilitates flexible change of a limiting plate, a solid rod is sleeved with the telescopic frame along with swinging and rotating, and the repulsive force of hollow balls at the upper end and the lower end is changed due to the change of magnetic blocks, so that the telescopic frame can extend while turning upwards; due to the flexibility of a variable ring, when the position of a movable ring is changed along with the telescopic frame, the movable ring can deform and abut against the outer side end of an electric connector, so the lower end opening protection effect is achieved; and when the speed of a walking wheel is reduced, a sleeve rod is matched with the telescopic frame, the limiting plate is reset to the transverse direction, and small-amplitude folding is achieved in the gradual reset process, so materials attached to the lower end face of the blocking body can fall off under the inertia effect, the movable ring can flexibly abut against the outer side of a rotating column, therefore, good protection is achieved, and muddy attachments can be removed in time.