The utility model relates to a condenser with drainage device, include: capacitor body, the insulating layer is located capacitor body's bottom, with capacitor body closely laminates, the drainage layer is located make for the heat conduction material bottom of insulating layer, with the insulating layer is closely laminated. The utility model discloses utilized the characteristics of the quick heat conduction in drainage layer, a large amount of heats of release conduct fast during to the rectification of high power capacity ware, then through the heat dissipation of outer wind channel, keep whole condenser electricity core temperature within 60 DEG C, and the guarantee condenser has sufficient rectification volume, improves the security and the life of condenser.