The invention discloses a zinc-aluminum coating process for a nylon locking nut. The zinc-aluminum coating process for the nylon locking nut consequentially comprises the following steps of (1) nut formation; (2) cleaning and deoiling; (3) shot-blasting and derusting; (4) primary zinc-aluminum coating; (5) nylon riveting; (6) secondary zinc-aluminum coating; (7) soaking in water; and (8) normal-temperature face coating. Or, the zinc-aluminum coating process for the nylon locking nut consequentially comprises the following steps of (1) nut formation; (2) cleaning and deoiling; (3) shot blastingand derusting; (4) nylon riveting; (5) primary zinc-aluminum coating; (6) secondary zinc-aluminum coating; (7) soaking in water; and (8) normal-temperature face coating. The zinc-aluminum coating process for the nylon locking nut has the beneficial effects that firstly, through shot blasting and derusting after nylon riveting, damage of shot blasting to a nylon ring can be avoided; and secondly,the nylon locking nut subjected to zinc-aluminum coating is soaked in water, so that moisture, lost due to high-temperature baking, of the nylon ring is compensated by means of the water absorptivityof nylon, and after soaking in water, the Young modulus and flexural modulus of the nylon ring are both decreased, the nylon locking nut is tested to be qualified through an assembly test, and burstsare avoided.