The invention relates to a tubular busbar displacement monitoring system based on supersonic waves, and the system comprises a supersonic range finding sensor and a reflection board. The supersonic range finding sensor is installed on a metal support below one side of a tubular busbar, and the reflection board is installed at an end of the tubular busbar at the other side. The supersonic range finding sensor is opposite to the surface of the reflection board. The system is mainly used for a scale pointer-type tubular busbar, employs the supersonic technology for the long-term monitoring of aninsulating tubular busbar, timely estimates the contact condition between the tubular busbar and a wire clamp, achieves the real-time monitoring function of displacement, irons out the defects that aconventional laser range finding system cannot meet onsite outdoor installation and operation high voltages, employs the supersonic range finding sensor for meeting the requirements of the outdoor installation, can control the measurement frequency, and can be widely used in the field of tubular busbar displacement monitoring.