  We present an arbitrary order discontinuous Galerkin finite element method
for solving the biharmonic interface problem on the unfitted mesh. The
approximation space is constructed by a patch reconstruction process with at
most one degree freedom per element. The discrete problem is based on the
symmetric interior penalty method and the jump conditions are weakly imposed by
the Nitsche's technique. The C^2-smooth interface is allowed to intersect
elements in a very general fashion and the stability near the interface is
naturally ensured by the patch reconstruction. We prove the optimal a priori
error estimate under the energy norm and the L^2 norm. Numerical results are
provided to verify the theoretical analysis.
