The utility model relates to a mobile phone dustproof plug, and specially refers to a multifunctional mobile phone dustproof plug comprising an audio frequency plug body; a first metal contact and a second metal contact of the audio frequency plug body are respectively connected with two electrodes of an UV-light emitter arranged in the tail of the audio frequency plug. Compared with the prior art, the multifunctional mobile phone dustproof plug is small in size, and plugged in a mobile phone audio frequency port, and practical and convenient; mobile phone is daily item carried by people in life, and people can use the function by only taking the mobile phone out; the UV-light employs a dustproof plug type design, can serve as a mobile phone dustproof plug, thus realizing one-object-multi-purpose; the multifunctional mobile phone dustproof plug is environment friendly and durable; the body needs no cell for power supply; if the mobile phone has power energy, a software switch can be opened for driving.