The invention discloses an aluminium alloy fire extinguisher valve body and a manufacturing method thereof. The aluminium alloy fire extinguisher valve body comprises a valve body, a pushing valve core hole, a nozzle, a handle fixing hole, a nozzle internal thread, a sealing ring, a handle fixing frame, an internal thread and an external thread; and the valve body is made of 6061 aluminium alloy which comprises the following chemical components: 0.8-1.2% of Mg, 0.4-0.8% of Si, 0.15-0.4% of Cu, 0.7% of Fe, 0.15% of Mn, 0.25% of Zn, 0.04%-0.35% of Cr, 0.15% of Ti and the balance of aluminium. Compared with a copper valve body, the aluminium alloy fire extinguisher valve body has the advantages of low cost, simple production technology, very light weight, long quality guarantee and high reliability, and the service life of a fire extinguisher is greatly prolonged as an oxidation film polarized on the surface of the valve body can prevent the corrosion of a fire extinguishing agent very well. Compared with the conventional aluminium alloy forging and molding manner, an aluminium alloy multi-directional die forging and molding manner adopted in the invention has the advantages that working procedures are reduced, the utilization rate of the materials can be greatly increased, the investment of equipment can be reduced, the energy consumption is low, and the production efficiency also can be greatly improved.