The invention provides a reversible lane signal lamp controlling method and system based on planar perception detection technology, ensures immediate changing of a signal lamp after vehicles in a reversible lane is cleared up, prevents safety risk due to opposite driving and improves road pass efficiency. Queue lengths of vehicles on inlet and outlet at the red-light direction of a reversible lane, and vehicles on inlet at the green-light direction can be detected on a real-time basis to obtain a jamming coefficient. When the queue length at the inlet of the red-light direction, namely jamming coefficient, satisfies changing conditions, the passing direction of the current reversible lane changes to improve the efficiency of vehicles passing the reversible lane. if the vehicles driving speed at the outlet of the red-light direction of the reversible lane is lower than a set threshold, the signal lamp may not change even if the direction changing conditions of the reversible lane are met. Through the reversible lane signal lamp controlling method and system, safety driving of vehicles is ensured, and passing efficiency of a reversible lane is improved.