NOVELTY - The invention provides a solar cell module capable of bidirectional arrangement and combination, which comprises a photoelectric unit, a transparent protection layer, and a circuit board. In which, the photoelectric unit is composed of a plurality of photoelectric elements (i.e. silicon wafer of solar cell), wherein the positive and negative electrodes of the neighbored photoelectric elements are electrically connected in sequence and in a serial connection to form the photoelectric unit in a plate form. Both ends of the photoelectric unit are respectively formed with a positive electrode and a negative electrode. The transparent protection layer is covered on the front side of the photoelectric unit to protect the photoelectric elements and ensure the sunlight may irradiate onto the photoelectric elements, and may be converted into electric energy by the photoelectric elements. The structure of the circuit board is corresponded to the structures of the photoelectric unit and the transparent protection layer. The top surface of the circuit board is attached to the back surface of the photoelectric unit for supporting the structure of the photoelectric unit. The circuit board is composed of an upper layer circuit, a resin substrate, and a lower layer circuit in sequence from top to down. The circuit layout of the upper layer circuit can be electrically connected with the positive electrode and the negative electrode respectively to enable the photoelectric elements to be electrically connected with the circuit layout of the lower layer circuit through the upper layer circuit. The circuit layout of the lower layer circuit is formed with a plurality of sets of contacts at the positions adjacent to the periphery, such that each of the solar cell modules can be arranged and assembled onto a plane (plane formed by X and Y axes) along the X axis (horizontal) and the Y axis (vertical), and may adjust the working voltage outputted by each set of contacts accordingly.