The invention relates to an indexing device of a full-automatic filling machine. The indexing device comprises a pawl I, a pawl II, a pawl III, an indexing wheel and an indexing shaft, wherein the indexing wheel is fixedly mounted on the indexing shaft; a plurality of tooth grooves are evenly distributed in the outer periphery of the indexing wheel; a long tension spring is connected between the pawl I and the pawl II; the hook parts of both the pawl I and the pawl II are clamped in tooth grooves of the indexing wheel; a short tension spring is connected between the pawl III and a push plate; the hook part of the pawl III is clamped in one tooth groove of the indexing wheel; the indexing shaft is fixedly mounted in the indexing center hole of the baseplate of the filling machine. The indexing device has a simple structure, works reliably and is low in manufacturing cost.