The invention discloses a remelted low-lead low-bismuth copper alloy with no hot crack and relates to the field of metal alloy material manufacturing technology. The remelted low-lead low-bismuth copper alloy with no hot crack comprises the following components of: by weight, 58-61% of Cu, 0.3-0.8% of Al, 0.009-0.35% of Zr, 0.008-0.035% of B, 0.05-0.20% of Pb, 0.1-0.40% of Bi, Mn being less than 0.15%, Si being less than 0.15%, Sn being less than 0.35%, Fe being less than 0.35%, and the balance being zinc and unavoidable impurities, wherein the total amount of the impurities is less than 0.25%. According to the copper alloy, the contents of the lead element and the bismuth element are minimized, thus reducing the harm to the environment and human body and decreasing the cost; The purity of gravity ingot casting melting is excellent, fluidity of the casting process is excellent, and thermal stress crack resistance is strong; the density of the microstructure is high, and crystal grains are fine and uniform; the cutting ability is raised, the polishing degree is excellent, there is no welding stress crack, the corrosion resistance is raised, and old copper materials can be recycled and reused while the cutting ability of the copper alloy is guaranteed.