Multi-functional cigarette lighting plug

The present invention relates to the automobile part field, especially to a multi-functional cigarette lighting plug. A multi-functional cigarette lighting plug comprises a housing, a firing pin, a circuit unit and USB interfaces. The housing comprises a circular pipe portion and a handle portion which are gun-shaped, the firing pin arranged in the circular pipe portion, the bottom of the firing pin is provided with a first spring, the other end of the first spring is abutted against a spring groove located at the inner wall of the handle portion, the right surface of the circular pipe portion is provided with positive electrode slices, the positive electrode slices are electrically connected with the power supply input positive port of the circuit unit, a pair of notches are symmetrically arranged at the pipe wall of the circular pipe portion, each notch is provided with a negative electrode slice, the negative electrode slices are electrically connected with the power supply input negative electrode port of