Multifunctional sampling device for shallow sea beach and sampling method

The invention discloses a multifunctional sampling device for a shallow sea beach and a sampling method. The multifunctional sampling device comprises a supporting table, a first collecting structure for collecting water samples at different depths, and a second collecting structure for collecting sediment samples at different points, wherein the first collecting structure comprises a fixing frame, a plurality of driving assemblies which are mounted on the fixing frame and are circumferentially distributed around the central axis of the fixing frame, and a plurality of first sampling assemblies which are mounted on the fixing frame and are in one-to-one correspondence with the driving assemblies; and the second collecting structure comprises an adjusting assembly, a sampling table capable of rotating and moving in the radial direction of the supporting table, a plurality of second sampling assemblies installed on the sampling table, and a counterweight assembly used for balancing weight. The multifunctional s