The invention provides a multifunctional ocean water quality monitoring device. The multifunctional ocean water quality monitoring device comprises a water quality monitoring floating pontoon, a storage hoop, a supporting rod, a solar panel, an intelligent displaying apparatus, a seawater quality detection apparatus, a seawater classified storage apparatus, a supporting frame, a driving motor, a winding shaft, a guiding rope, a seawater collection apparatus, a flotage fishing apparatus, a battery mounting plate, a storage battery, a warning ball structure and a photovoltaic controller, whereinthe storage hoop is welded on the left side and the right side of the front surface of the water quality monitoring floating pontoon. By arranging an electromagnetic valve, a shallow water level collection bottle and a deep water level collection bottle, the electromagnetic valve can be opened when in a shallow water level or a deep water level, and the seawater at the shallow water level or thedeep water level can be sampled; by arranging a seawater quality sensor, a seawater temperature sensor and a seawater salinity sensor, the sweater in a detection hopper can be conveniently detected; and by arranging a classification tag, the seawater can be stored in a classifying manner, and the seawater is easy to classify when in storage and fetching.