An optical implementation of Haar wavelet transform is presented. In this method, Haar wavelet mask is prepared by thin film coating, holographic matched filters of wavelet functions are recorded in a piece of photorefractive crystal, and confocal optical systems are used as a correlator with zoom lens. A brief theoretical analysis and experimental results are given. This optical wavelet transform possesses some evident advantages, such as, simple and real- time operation, high resolution and high light efficiency, and large dada capacity.