Optical fiber insulator insertion loss detector

The invention discloses an optical fiber insulator insertion loss detector, which comprises an SLD light source, a light source driving module, a beam splitter, a first emergent optical fiber, a second emergent optical fiber, an incident optical fiber, an AD acquisition circuit and an output display device, wherein the beam splitter can split inputted light signals into two beams of light signals whose intensity ratio is close to 1 to 1 and output the light signals; the AD acquisition circuit is provided with a first light power measurement module and a second light power measurement module which can measure light power of the inputted light signals and output light power measurement values by using digital signals; and the output display device records a light power measurement value outputted by the first light power measurement module as an input light power value, records a light power measurement value outputted by the second light power measurement module as an output light power value, calculates the insertion loss of a detected optical fiber insulator and displays the insertion loss in real time. The optical fiber insulator insertion loss detector can realize detection and display on the input light power value, the output light power value and the insertion loss of the detected optical fiber insulator, and has the advantages of precise measurement, easy operation, and convenient calibration.