Multifunctional adaptor for windshield wiper and assembly using the same

A multifunctional adaptor for windshield wiper (1) and assembly using the same are disclosed. The multifunctional adaptor for windshield wiper (1) includes a main body (11), a lodging device, a first flexible fastening device and a second flexible fastening device. The fastening device is disposed at two sides of a rear end of the main body (11) to hook with a barb portion of a windshield wiper arm (200,400). An arm of the first flexible fastening device is disposed to a front end of the main body (11) to fasten a protrusion portion (201,401) of the windshield wiper arm (200,400). The second flexible fastening device is connected to a side of the main body (11) to lean against an inner side of the windshield wiper arm (200,400) or fasten a leaning side of a through hole of the windshield wiper arm.