The invention relates to an output regulation circuit. The output relation circuit is connected with an output end of a charger, and the charger is used for charging a storage battery. The output relation circuit comprises a battery, a negative electrode line and a double-contact direct-current contactor. A negative electrode of the battery is electrically connected with a negative electrode of the charger; one end of the negative electrode line is connected with a positive electrode of the battery, and the other end thereof outputs current and voltage; the double-contact direct-current contactor comprises a normally closed contact and a normally open contact; the normally closed contact is connected with the negative electrode of the charger; and the normally open contact is connected with the positive electrode of the battery and an output end of the negative electrode line. The invention further provides the charger, and the charger comprises the output regulation circuit. The output regulation circuit and the charger provided by the invention can solve the problem that the charger cannot perform online protection on the storage battery in a traditional scheme.