NOVELTY - The block (1) has a block main body (2) comprising a recessed part (2d) surrounded by a base plate part (2a), a retaining wall part (2b) and a top plate part (2c). A supporting member supports the solar cell panel (3), so that installation angle of solar cell panel is controlled within the recessed part of the block main body. The supporting member comprises an adjustment member (4a) that adjusts distance between the solar cell panel and the block main body. An upper part and a lower part of the solar cell panel are supported by the adjustment member.    USE - Civil engineering block for retaining wall used to prevent disintegration of soil in mountain slope and river bank.    ADVANTAGE - The supporting member supports the solar cell panel, so that installation angle of the solar cell panel is controlled within the recessed part of the block main body, thus eliminating the problem of ensuring installation place of the solar cell panel and the troublesome processes of installing the solar cell panel in the block, and hence reducing man power and installation cost of the block. The solar panel is provided in the recessed part surrounded by the base plate part, the retaining wall part and the top plate part, thus preventing invasion of wind under the solar cell panel, and hence avoiding the danger of blowing off the solar cell panel by strong wind. The solar cell panel is protected within the recessed part during storage or conveyance of the solar cell panel, and the solar panel is integrated previously in a factory, thus reducing workload in a field and reducing construction cost. The angle of the solar cell panel can be easily adjusted, thus improving electric power generation efficiency by adjusting appropriate angle of the panel.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a civil engineering block.    Civil engineering block (1)    Block main body (2)    Base plate part (2a)    Retaining wall part (2b)    Top plate part (2c)    Recessed part (2d)    Solar cell panel (3)    Adjustment member (4a)