Disclosed is a process for processing a bent aluminium tube water-cooling heat dissipation die-cast cavity, comprising the following steps: S1. selecting a tube; S2. annealing the aluminium tube; S3. bending the aluminium tube; S4. welding a water faucet; S5. reinforcing the aluminium tube; S6. after the completion of step S5, placing the bend-formed aluminium tube into a die-casting mould, and positioning same using a positioning device inside the die-casting mould; S7. mould-clamping and die-casting: after clamping the die-casting mould, pouring an aluminium alloy solution into a melting cup of a die-casting machine, injecting the aluminium alloy solution into the mould through a pressure injecting force of the die-casting machine, and wrapping the aluminium tube with the aluminium alloy solution; S8. opening the mould and taking out the cast: after the completion of the pressure injecting, under the action of pressurizing, enabling the aluminium alloy and the aluminium tube to be closely combined as a whol
