Switching power supply

The utility model discloses a switching power supply, include: the main casing body, the switch tube is through insulation heat conduction glue and the fixed water -cooling piece of switch tube to and be fixed in the radiating block of the external wall of main casing, be equipped with a plurality of second water courses in the radiating block, the inner chamber of each second water course is hollow circular cylinder shape inner chamber, the inner wall arch of each second water course has a plurality of cylindrical convex cylinder, projection in the same second water course, their axle center is perpendicular with the axle center of this second water course, projection in the same second water course, they are located same cylindrical spiral line with the junction of this second water course inner wall, projection in the same second water course, their tip do not is fixed with heat conducting ball, and each heat conducting ball's the centre of sphere is located the axle center of this second water course, on