  We study the doubly charmed baryon $\Xi_{cc}^+$ in high energy nuclear
collisions. We solve the three-body Schroedinger equation with relativistic
correction and calculate the $\Xi_{cc}^+$ yield and transverse momentum
distribution via coalescence mechanism. For $\Xi_{cc}^+$ production in central
Pb+Pb collisions at LHC energy, the yield is extremely enhanced, and the
production cross section per binary collision is one order of magnitude larger
than that in p+p collisions. This indicates that, it is most probable to
discover $\Xi_{cc}^+$ in heavy ion collisions and its discovery can be
considered as a probe of the quark-luon plasma formation.
