The invention discloses a soldering lug with an anti-reversal function and a battery pack thereof, and relates to the technical field of batteries. The soldering lug comprises a connecting end which is connected with a battery, and a leading-out end which is welded with a battery pack shell, wherein the connecting end is provided with a raised line; the surface of the leading-out end is coated with a tin coating, and provided with a process gap; the leading-out end and the connecting end are integrally molded by punching. The battery pack comprises the soldering lug, the battery pack shell, apositive electrode cavity and a negative electrode cavity, wherein a positive electrode positioning groove and a negative electrode positioning groove which are mounted in cooperation with symmetrically-arranged soldering lugs are symmetrically arranged at an upper end of the battery pack shell; the positive electrode cavity and the negative electrode cavity are formed side by side; an upper end part of the positive electrode cavity is provided with a positive electrode boss; a lower end part of the negative electrode cavity is provided with a negative electrode boss. Through adoption of the soldering lug with the anti-reversal function and the battery pack thereof provided by the invention, the problems of reverse placement of the soldering lug, insufficient soldering and difficulty in tin soldering are solved, and the situation of reverse mounting or reverse bonding of the battery pack during manufacturing is prevented.