The utility model relates to a multifunctional swimming aid which comprises a wearing device, a backpack, a control handle and at least two propellers. Wherein a control cabin and a battery cabin which are independently distributed are arranged in the backpack, and a control handle quick-plug interface and at least two propeller quick-plug interfaces are formed in the outer part of the backpack; the control handle is provided with a control key for a user to input a control instruction; the control handle is electrically connected with the control cabin and the battery cabin through a cable orthrough a control handle quick plug interface; the propeller is electrically connected with the control cabin and the battery cabin through a cable or a propeller quick plug interface; the swimming aid can be fixed on the body of a user through the wearable device. By the adoption of the swimming aid, a user can adjust the swimming aid speed by himself/herself, the swimming aid can be detached and combined, and multiple swimming aid modes are achieved.