The invention provides a monitoring method for a water surface oil spilling monitoring device based on ultraviolet reflection and belongs to the field of oil spilling monitoring. An LED light emitting module can emit ultraviolet light, the ultraviolet light enters a light sensor after being reflected by the water surface, the light sensor converts a received light signal into a voltage signal and sends the voltage signal to a main control board for processing, the main control board sends the signal to an upper computer, and when oil spilling occurs on the water surface, the intensity of reflected ultraviolet light received by the light sensor becomes stronger, the voltage signal becomes larger, the main control board sends the processed signal to the upper computer for processing, the upper computer gives a short message alarm to related responsible persons through a short message alarm module, and a valve is closed through a valve controller; a pollution source is timely and rapidly cut off, and enlargement of the pollution scope is avoided.