The invention provides a preparation method of a full-print zinc oxide ultraviolet detector. In the preparation method of the zinc oxide ultraviolet detector, a mixed solution of hydrochloric acid, citric acid, polyethylene glycol and water at a proper proportion is adopted; an ITO trench is formed from the mixed solution by directly adopting a printing method; by virtue of the mixed solution, wettability on a substrate can be lowered, and a phenomenon of severe mismatching between a printed pattern and a formed trench pattern caused by difficulty in controlling the pattern edge in side edge corrosion in the ITO corrosion can be reduced; in addition, in the preparation method, nanometer silver ink is printed according to scattered spot shapes; and strong optical absorption is generated bysurface plasma resonance formed between Ag nanoparticles and ZnO. The preparation method is simple, low in cost and high in operability; the ITO trench is formed by adopting the printing method; and therefore, compared with the conventional method for manufacturing an electrode pattern through pattern photoetching and acid corrosion of a conductive layer, the preparation method disclosed in the invention does not generate a large amount of corrosive liquid emission pollution.