  In part I of the foundation of the hyperunified field theory, we have shown
the presence of entangled hyperqubit-spinor field as fundamental building block
with appearance of Minkowski hyper-spacetime as free-motion spacetime and
emergence of inhomogeneous hyperspin symmetry as fundamental symmetry. In this
paper as part II, we demonstrate by following along gauge invariance principle
and scaling invariance hypothesis that the inhomogeneous hyperspin gauge
symmetry and scaling gauge symmetry govern fundamental interactions and reveal
the nature of gravity and spacetime. With the fiber bundle structure of biframe
hyper-spacetime and emergence of non-commutative geometry, we explore
methodically the gauge-geometry duality and genesis of gravitational
interaction in locally flat gravigauge hyper-spacetime. A whole hyperunified
field theory in 19-dimensional hyper-spacetime is established to unify not only
all discovered leptons and quarks into hyperunified qubit-spinor field but also
all known basic forces into hyperunified interaction governed by inhomogeneous
hyperspin gauge symmetry. We present a systematic investigate on the
hyperunified field theory with deriving the dynamics of fundamental fields as
basic laws of nature and conservation laws relative to basic symmetries and
showing Higgs-like bosons and three families of lepton-quark states. We provide
a detailed analysis on inflationary early universe with evolving graviscalar
field and a discussion on scaling gauge field as dark matter candidate and
$\cQ_c$-spin scalar field as source of dark energy.
