This invention discloses a system for cleaning a streetlamp through raindrops. The system comprises a lamp shell plate fixed to an installing frame; a rotating lampshade is arranged below the lamp shell plate; a lamp body is arranged in the rotating lampshade; a sleeve shaft is arranged at one end of the rotating lampshade and connected with a motor; the motor is arranged in the installing frame; wipers are arranged on the two sides of the inner wall of the lamp shell plate; rain guiding holes are formed in the portions, above the wipers, of the two sides of the lamp shell plate; rain guiding plates are hinged in the rain guiding holes through torsion springs; each rain guiding plate comprises a lower short plate and an upper long plate; limiting lugs are arranged at the two ends of each lower short plate and provided with iron blocks; electromagnets are arranged on the lamp shell plate and located below the rain guiding holes; each lower short plate is located on the inner side of the lamp shell plate, and each upper long plate is located on the outer side of the lamp shell plate; each wiper comprises an elastic base fixed to the lamp shell plate, a telescopic base is arranged on each elastic base, and a compression spring is arranged at the bottom of each elastic base; the telescopic bases are connected with fixing strips; and sponge brushes are arranged on the fixing strips. The system can improve the protecting strength of the streetlamp body, the streetlamp can be cleaned in real time through rainwater, the cleaning effect is good, and energy consumption is low.