The invention discloses a method for manufacturing a nickel-copper alloy valve body for precision casting. The valve body is characterized by comprising the following chemical components in percentage by weight: 15-17 percent of Ni, 3-4 percent of Al, 8-9 percent of Mg, 0.03-0.04 percent of Sn, 0.03-0.04 percent of Sb, 0.01-0.02 percent of Ca, 0.03-0.04 percent of Bi, 0.01-0.02 percent of Ti, 0.01-0.02 percent of Mn, 0.02-0.03 percent of Y, 0.03-0.04 percent of Mo, and the balance of copper and inevitable non-metal impurities. According to the method, a precision casting and shot blasting technology is adopted, so that the compactness of the valve body can be improved, the process can be simplified, the production efficiency can be improved, and the production cost can be reduced.