Abstract: A doubly-sealed waterproof floodlight includes a heat dissipating portion, a lighting portion coupled to the bottom end of the heat dissipating portion, and a cover filled and coated with a sealing material, doubly-sealed, and integrally coupled to the heat dissipating portion. The heat dissipating portion includes a sealing portion formed on a side end of the heat dissipation portion, coated with the sealing material, and coupled to the cover. The cover includes a coupling portion formed on the top end of a side surface thereof. The coupling portion includes a sealing groove into which sealing material is filled for adhering and coupling the heat dissipating portion, a protruding support potion extending from the sealing groove, and a bottom surface portion which is flatly formed at a position lower than the protruding support portion, and in which the sealing material coated on the sealing portion is filled.