The invention discloses a machining technology of aluminum alloy disc type multi-cavity high-precision parts. The machining technology comprises the following steps of, A, carrying out rough turning;B, performing aging treatment I, specifically, completely soaking aluminum alloy raw materials subjected to rough turning treatment in the step A into rust-proof oil, taking out the parts, carrying out heating-cooling alternative treatment, carrying out heat treatment in 20 seconds or less and then cleaning the parts; C, carrying out rough milling; D, carrying out aging treatment II, specifically,carrying out room temperature aging treatment on the aluminum alloy raw materials subjected to rough milling treatment in the step C; E, carrying out finish milling; F, carrying out aging treatment III, specifically, carrying out medium-high temperature aging treatment on the aluminum alloy disc type multi-cavity high-precision parts; and G, carrying out finish turning. According to the machiningtechnology, the stress relief aging is performed in time after the large allowance is cut, so that no stress exists in the next working procedure; meanwhile, the high-precision fit dimension is reserved in the last working procedure, so that the parts with the precision in dimension is ensured to be no longer deformed after being machined; and necessary mould fixing parts are manufactured for machining, so that the precision requirement of the dimension is ensured.