A bracket for a high-power marine diesel engine booster is mounted on a machine frame of a marine diesel engine and comprises an upper structural part and a lower structural part. The upper structural part is a frame type part, an upward booster bearing face is arranged on the upper portion of the upper structural part, a downward supporting connection face is arranged on the lower portion of the upper structural part, a backward machine frame connecting face is arranged on the rear portion of the upper structural part, an air cavity is formed in the middle of the upper structural piece, and the booster and an air cooler are mounted on the upper structural part. The lower structural part comprises a left supporting piece and a right supporting piece which are symmetrical, a high-temperature water pump, a low-temperature water pump and a lubricating oil pump are mounted between the left supporting piece and the right supporting piece, the left supporting piece is a plate-shaped part, an upward supporting face and a backward upper connecting face are arranged on the upper portion of the left supporting piece, a backward lower connecting face is arranged on the lower portion of the left supporting piece, and the right supporting piece is the same as the left supporting piece in structure. The bracket has the advantages of being good in universality, convenient to mount, low in cost and suitable for the high-power marine diesel engine.