A novel integrated device of optofluidic variable-focus microlens array is proposed to solve the problems of electrical focus-tuning and integration fabrication of microlens array. The basic structure of the array includes a core chip sandwiched between two glass covers. The core chip is made from electric conductor to simplify the device design and the fabrication technics. The lens materials consist of two kinds of immiscible liquids with different refractive index. The meniscus between two liquids is used as optical lenses. The focal distance is tuned by changing the curvature of this meniscus through the effect of electro-wetting.