The invention discloses a solar cell unit, a photovoltaic cell module and a preparation technology of the photovoltaic cell module. The solar cell unit comprises front bus electrodes, a front interconnection electrode, back bus electrodes and a back interconnection electrode, wherein the front bus electrodes are provided with a first reinforced metal layer with a specular reflection effect; the front interconnection electrode is arranged on the edge of the front side of the cell unit and connected with the front bus electrodes and/or the first reinforced metal layer; the back bus electrodes are provided with a second reinforced metal layer; and the back interconnection electrode is connected with the back bus electrodes and/or the second reinforced metal layer. Through the arrangement of the reinforced metal layers, the utilization rate of a photovoltaic cell on incident light is improved, the internal resistance of the cell unit is reduced, the series connection process of cells is simplified through coordinated application of interconnect metal layers and the interconnection electrodes, and meanwhile, the series connection spaces between the cells are concealed, so that the effective power generation area of the photovoltaic module is increased and the structure is stable.