The invention relates to a remote overheating alarm device of an outlet joint of a distribution transformer, and the remote overheating alarm device comprises a signal acquisition circuit, a signal judgment circuit, a wireless alarm transmission circuit, wherein the signal acquisition circuit is connected to the signal judge circuit, and the signal judgment circuit is connected to the wireless alarm transmission circuit. According to the invention, on-line monitoring and intelligent alarm for the temperature at the outlet and lead joint of the distribution transformer are realized; when the temperature of the outlet lead joint of the running distribution transformer is greater than the specified value, the relays of the signal acquisition circuit and signal judgment circuit operates to cause normally open contacts to be subjected to actuation, an overheating signal is immediately transferred to the wireless alarm transmission circuit, and remote alarm is carried out; the signal is transferred to the mobile phone of an operator on duty or a duty room with Internet, and the operator on duty gets to the site immediately to deal with the accident after getting the alarming situation, the time of electrical equipment breakdown treatment is shortened, the damage rate of the equipment is reduced, the reliability of the power supply is improved, and the enterprise benefits and social benefits are increased.