The invention belongs to the technical field of bridge erection, and discloses a double-row front supporting leg for a bridge erecting machine. The bridge erecting machine comprises a main beam, double-row front supporting legs are arranged at the front end position of the main beam, the double-row front supporting legs comprise first front supporting leg and a second front supporting leg; the first front supporting leg is positioned in front of the second front supporting leg, stand columns of the first front supporting leg and the second front supporting leg adopt a sectional structure of anupper section and a lower section, under the action of a hydraulic cylinder, the upper section is inserted into the lower section and is fixed through a pin shaft, so that the lower section and the upper section are connected into a whole. The bridge erecting machine can meet a function of a front supporting leg of a common bridge erecting machine, and can solve the problem that the integral hoisting of a gird which the front end exceeds a capping beam and the front end closed is solved; and for solving the integral hoisting problem of the gird with the hoisting length larger than the span and the front end closed, the front supporting legs of the bridge erecting machine are two rows, a front cross beam can penetrate through the front supporting legs in a cross-stretching manner, so thatthe hoisting of the type of the gird is realized.