The invention discloses an optical fiber breakpoint position detection method, device and system. The method comprises the steps of: sampling optical fiber electrical signals to obtain a plurality of signal values and corresponding sampling time when the optical fiber electrical signal is obtained, wherein the optical fiber electrical signals are converted from optical signals reflected by the optical fiber; determining first sampling time corresponding to the signal value less than a first threshold; when the signal value corresponding to second sampling time before and adjacent to the first sampling time is larger than a second threshold and an absolute value of the difference between the signal value corresponding to the second sampling time and the signal value corresponding to third sampling time before and adjacent to the second sampling time is larger than a third threshold, calculating a distance between an optical fiber breakpoint and an optical fiber tail end according to the second sampling time so as to determine the position of the optical fiber breakpoint. By means of the above mode, the precision and the efficiency of optical fiber breakpoint detection can be improved.