  Solitons in multi-component Bose-Einstein condensates have been paid much
attention, due to the stability and wide applications of them. The exact
soliton solutions are usually obtained for integrable models. In this paper, we
present four families of exact spin soliton solutions for non-integrable cases
in spin-1 Bose-Einstein Condensates. The whole particle density is uniform for
the spin solitons, which is in sharp contrast to the previously reported
solitons of integrable models. The spectrum stability analysis and numerical
simulation indicate the spin solitons can exist stably. The spin density
redistribution happens during the collision process, which depends on the
relative phase and relative velocity between spin solitons. The non-integrable
properties of the systems can bring spin solitons experience weak amplitude and
location oscillations after collision. These stable spin soliton excitations
could be used to study the negative inertial mass of solitons, the dynamics of
soliton-impurity systems, and the spin dynamics in Bose-Einstein condensates.
