Electronic ballast casing

The utility model discloses a casing of an electronic ballast which is particularly applicable to outdoor illuminator. The utility model overcomes the disadvantages of the prior art that the prior casing of electronic ballast is poor in sealing and is not favorable to waterproof, and adopts the technology that the middle of the casing of an electronic ballast is designed into a hollow metal shell; two ends of the metal shell are sleeved with polymer shells made of dies, and the docking diameters of the polymer shells and the metal shell are matched; a plurality of line holes are opened at the outside of the polymer shells. Thus the utility model is good in heat dissipation, which avoids the aging of the wire caused by high temperature and prolongs the service life thereof. And the utility model has favorable sealing and waterproof effect, which is particularly applicable to illuminators in all outdoor environment.