The invention discloses an edge trimming, punching and hole flanging one-time forming process for a basin stand. The process includes the steps that a forming die is provided, wherein the forming die comprises a lower die and an upper die, the lower die comprises a female-and-male die and a cutter, the female-and-male die is provided with a mating hole, and the upper die comprises a female die and a hole flanging punching pin corresponding to the mating hole; the upper die is installed on an upper sliding block, capable of vertically moving, of a press, and the basin stand which needs edge trimming and hole flanging is placed on the lower die for locating; the upper sliding block drives the upper die to move downwards, the female-and-male die enters the female die, the edge of the basic stand is removed, waste is removed by the cutter, the hole flanging punching pin enters the mating hole of the female-and-male die to punch through the basic stand, a round hole is formed in the basin stand, the edge of the punched-through round hole is flanged, and then a flanged hole is obtained. The edge trimming, punching and hole flanging one-time forming process for the basin stand improves production efficiency.