  Celestial amplitude is a new reformulation of momentum space scattering
amplitude and offers a promising way for flat holography. In this paper, we
study the celestial amplitude in $\mathcal N=4$ Super-Yang-Mills (SYM) theory
aiming at understanding the role of superconformal symmetry in celestial
holography. We first construct the superconformal generators acting on the
celestial superfield which assembles all the on-shell fields in the multiplet
together in terms of celestial variables and Grassmann parameters. These
generators satisfy the superconformal algebra of $\mathcal N=4$ SYM theory. We
also compute the three-point and four-point celestial super-amplitude
explicitly. They can be identified as the correlation functions of the
celestial superfields living at the celestial sphere. We further study the soft
and collinear limits which give rise to the super-Ward identity and super-OPE
on the celestial sphere, respectively. Our results initiate a new perspective
of understanding the well-studied $\mathcal N=4$ SYM amplitude via 2D celestial
conformal field theory.
