  We obtain a high-dimensional Schwarzschild black hole solution in the
scalar-tensor-vector gravity (STVG), and then analyze the influence of
parameter $\alpha$ associated with a deviation of the STVG theory from General
Relativity on event horizons and Hawking temperature. We calculate the
quasinormal mode frequencies of massless scalar field perturbations for the
high-dimensional Schwarzschild STVG black hole by using the sixth-order WKB
approximation method and the unstable null geodesic method in the eikonal
limit. The results show that the increase of parameter $\alpha$ makes the
scalar waves decay slowly, while the increase of the spacetime dimension makes
the scalar waves decay fast. In addition, we study the influence of parameter
$\alpha$ on the shadow radius of this high-dimensional Schwarzschild STVG black
hole and find that the increase of parameter $\alpha$ makes the black hole
shadow radius increase, but the increase of the spacetime dimension makes the
black hole shadow radius decrease. Finally, we investigate the energy emission
rate of the high-dimensional Schwarzschild STVG black hole, and find that the
increase of parameter $\alpha$ makes the evaporation process slow, while the
increase of the spacetime dimension makes the process fast.
