The invention provides a compound tunnel shield suitable for construction of
complex formation, relating to an architectural construction machinery. The compound tunnel shield comprises a compound cutter head suitable for construction of soft soil formation, hard rock formation, formation with uneven
hardness and compound formation with both soft soil and hard rock; 3 excavation
modes adopting an open mode, a local
atmospheric pressure mode or an excavated surface stabilization mode of an
earth pressure balance mode according to different geological characteristics of the geology, and a ground conditioning
system; the cutter head is respectively provided with a soft soil layer construction tool and a hard rock layer construction tool, cutters are changed to adapt to different formations in the process of the construction thereof; addition agent is injected into the cutter
head surface, a soil chamber or a screw conveyer and the addition agent and
muck are mixed by rotary stirring of the cutter head, the soil chamber or the screw conveyer to adapt to different formations through ground conditioning. The invention solves the problem of safe construction of the tunnel shield in soft soil, decomposed rock, formations with uneven
hardness, sand layer and sand gravel formation, etc.