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ZnO thin film has been successfully synthesized by sol-gel spin coating method. The compounds used were zinc acetate, isopropanol, and diethanolamine. The ZnO thin film was grown a FTO glass substrate, and annealed at 500 degree celcius. The variation of the hold time is consecutively 30, 60, 90, 150 minutes. The XRD results show that the ZnO thin film crystal structure is wurtize hexagonal. The smallest crystal size is 22.3 nm when the hold time is 30 minutes. SEM results show the morphology of the thin films is a uniform round granules. The UN-Vis results show that the sharp increase in transmission is in the range of 350 to 400 nm wavelength.