The invention provides a tunnel construction platform machine. The tunnel construction platform machine comprises a mobile platform, a vertical lifting platform and at least one horizontal side extending platform; the vertical lifting platform capable of extending and retracting vertically is connected to the mobile platform; the horizontal side extending platform capable of extending and retracting horizontally is connected to the vertical lifting platform; and the vertical lifting platform can conduct vertical telescopic adjustment on the mobile platform according to the size of the cross section of a tunnel. The tunnel construction platform machine can be suitable for sizes of excavated cross sections of tunnels with different specifications, and is convenient to move by arranging the mobile platform.