The invention relates to a novel system for measuring foam expansion and drainage time of fire foam. The system comprises a motor, a chain, a rotating wheel, a rotating wheel fixing rack, a connecting rod mechanism, a measuring device and a measuring device fixing rack, wherein the output end of the motor is connected with one end of the chain; the other end of the chain is connected onto the rotating wheel; the rotating wheel is fixed on the rotating wheel fixing rack; one end of the connecting rod mechanism is fixed on a central shaft of the rotating wheel, and the other end of the connecting rod mechanism is movably connected onto the measuring device; the measuring device is fixed on the measuring device fixing rack; the measuring device comprises a foam measurer, a chute, a weighing beaker, an electronic scale and a timer; the foam measurer is movably connected with the connecting rod mechanism and fixed on the chute in a sliding manner; the weighing beaker and the electronic scale are fixed just under the foam measurer; the weighing beaker is arranged on the electronic scale; an automatic shut-off cock is arranged at the bottom of the foam measurer. The system disclosed by the invention is simple in operation, wide in application, sample-saving and wide in application environment range.