The invention discloses an automatic assembly process of a precise infusion device, in particular an automatic assembly process of a precise filter part in a precise infusion device. The automatic assembly process comprises the steps of: (a) a loading step of a precise filter; (b) a gluing step of a liquid inlet guide pipe and an infusion guide pipe; (c) a loading step of the liquid inlet guide pipe; (d) an assembly step of a liquid inlet runner and the liquid inlet guide pipe of the precise filter; (e) a loading step of the infusion guide pipe; and (f) an assembly step of a liquid outlet runner and the infusion guide pipe of the precise filter. The automatic assembly process solves the technical problem of improving the production efficiency of the precise infusion device, needs no manual operation in the process of finishing insertion assembly of the filter and the liquid inlet guide pipe and the infusion guide pipe on the whole precise infusion device, and is high in automation degree and assembly production efficiency; and meanwhile, compared with such problems as easiness in generation of fatigue and easiness in deformation in operation under the condition of long-time work by assembly staff, the automatic equipment has the advantages of efficient, stable and continuous work under the long-time high-strength environment.