Abstract: The present disclosure relates to a low-level laser therapy device using a light-emitting diode (LED) endoscope cap. One aspect of the present disclosure may include a catheter formed to extend so as to be inserted into a body of a patient and including an air insufflation part for stretching the mucosal folds of the duodenum of the patient, an endoscope cap having a through hole therein to allow the catheter to be inserted therethrough, a hood disposed in one region outside the endoscope cap and disposed such that at least one region thereof protrudes forward from the endoscope cap, and one or more LEDs disposed on each of the endoscope cap and the hood.