A waterproof ear jack socket includes: an upper socket having at least one slit formed such that a first portion of a contact terminal passes through one surface of the upper socket to be exposed to the outside; a lower socket having a recess for engaging a second portion of the contact terminal on one surface thereof facing the upper socket, the lower socket being coupled to the upper socket to form a plug insertion hole into which an ear jack plug is inserted; and a waterproof cover attached to an outer circumference of a socket body formed by coupling the upper socket and the lower socket.