The invention discloses a water wave lateral erosion capacity observing system and belongs to the technical field of detection of water wave impact strength. The water wave lateral erosion capacity observing system comprises a water wave lateral impact strength observing group, a water wave erosion transfer earth-stone particle collecting and observing group and a wind power and wind direction observing group. The water wave lateral impact strength observing group is composed of an anti-impact contact area, an anti-impact pressure area, an anti-impact measurement area and a data collection box. The anti-impact contact area comprises a sliding relay plate and a lateral impact force protection plate. The anti-impact pressure area comprises all stress-level springs, spring connection holes, awater-proof index main pipe, a water-proof hose pipe and a lateral impact force protection plate. The anti-impact measurement area comprises an airtight water-proof box, upper, lower, left and rightmeasurement pointers, counting electric-logging plates which correspond to the springs, and data transmission lines. The data collection box comprises a data receiver, a battery and a solar panel. Thewater wave lateral erosion capacity observing system can provide data analysis for the water wave erosion capacity, the side slope erosion particle level and sediment accumulation area capacity of the rivers, lakes and reservoir areas.