The invention discloses a dual-mode compound shield testing machine which comprises a shield testing machine, wherein the shield testing machine comprises a shield shell; the front end of the shield shell is provided with a cutter head; the shield shell is internally provided with a soil compartment partitioned by a soil compartment clapboard; the soil compartment is internally provided with a stirring rod along the radial direction; the back surface of the soil compartment clapboard is connected with a grout pipe and a spiral unearthing device; and the spiral unearthing device is communicated with the soil compartment. The grout pipe can be used as a pipeline for muck modifying agents such as foam; and under a balanced mode, the grout pipe can be used as a slurry inlet and outlet pipeline, so that the conversion of working modes of the shield testing machine can be realized easily.