An underwater communication method is applied to a first electronic device. The method includes: receiving a first operation of a user, and in response to the first operation, setting an identity of the first electronic device to a first identity; when the first electronic device is underwater, receiving a second operation of the user, and in response to the second operation, displaying one or more messages, where the one or more messages include a first message; and receiving a third operation of choosing, by the user, to send the first message, and in response to the third operation, sending a first acoustic wave signal, where the first acoustic wave signal carries the first message and the first identity.