The invention relates to an experimental boundary condition simulator for a semi-structural vibrating table. The boundary condition simulator consists of an upper fixed plate, a middle sliding plate, a lower fixed plate and a dead bolt. The simulator can simulate common boundary conditions of various structural experiments, and the simulation of different boundary conditions can be simply and quickly switched. After the simulator is used, a structural engineer can complete experimental contents designed by a whole structure by installing and loading a semi-structure, therefore the using efficiency of the vibrating table can be greatly improved, and the advance rate of scientific research can be improved greatly.