The invention discloses a vehicle door buffer device, and belongs to the technical field of automobile manufacturing. The vehicle door buffer device comprises a threaded column which is arranged on the lower portion of an inner plate of a vehicle door and is in threaded connection with a buffer block, and a pressure-sensitive element which detects the gap between the vehicle door and a vehicle body when the vehicle door is closed is arranged on the buffer block; and a rotating shaft driven by a motor is fixed below the threaded column, and a wiring pin of the pressure-sensitive element penetrates through a core hole of the buffer block, a core hole of the threaded column and a core hole of the rotating shaft to be connected with the motor through a control module. The device can solve theproblems that the matching gap between an existing door assembly and a vehicle body difficultly guarantees avoidance of interference, paint damage and deformation between a vehicle door and the vehicle body during vehicle door closing or driving processes.