The invention provides an environment-friendly integrated multi-purpose plug-in water-surface photovoltaic power generation system. The system includes a surrounding continuous operation and maintenance channel and a plurality of operation and maintenance channels in the length direction and width direction; the length-direction operation and maintenance channels can be used for continuously paving a channel floating body, a pedal can be used at intervals to replace the channel floating body, and higher light transmittance and better hydrophilicity can be achieved; the operation and maintenance channels can segment the surrounding continuous operation and maintenance channel into a number of photovoltaic power generating areas, power generation support networks are arranged in the photovoltaic power generation areas, and the insides of the power generation support networks are connected with a photovoltaic module, power generation equipment or cables and the like arranged on the floating body. The system achieves the important functions of the water-surface photovoltaic-power-station photovoltaic module, electrical equipment, cable laying, channel maintenance and the like, and thewater-surface photovoltaic power generation system which is simple in structure, cheap in installation, low in cost, high in light transmittance, good in hydrophilicity and stable in structure is formed.