In the present work a thin film of new 3, 3', 3'', 3'''-tetra poly (1, 4-diaminobenzen phthalate) phthalocyanine copper (II)  (300–900 nm) have been prepared by spin-coating technique and studied the optical properties. The optical properties and optical constants have been investigated means of transmittance and reflectance spectra were measured in the wavelength range (300-900) nm. The optical energy gap E_g was estimated from the absorption coefficient values using Tauc’s procedure. The optical absorption spectra shows that the absorption mechanism is a direct allowed transition. The oscillator energy E_o, dispersion energy E_dand other parameters have been determined by the Wemple–DiDomenico method.