Excitons in transition metal dichalcogenides (TMDCs) have appealed as a platform for quantum many-body phenomena and optoelectronic devices. Lifetime engineering is the key to the versatile application of two-dimensional excitons, ranging from picosecond to microsecond timescale. Vacuum-field engineering based on conventional planar mirror has been recently proposed to manipulate the radiative decay dynamics of excitons via purely environmental way. However, the conventional planar mirrors are inappropriate for accommodating the exotic functionalities of two-dimensional excitonic devices, such as, potential landscape induced exciton diffusion and polarisation-dependent quantum confinement. Here, we present a meta-mirror platform controlling radiative decay dynamics of excitons in TMDC monolayer. Subwavelength-scale plasmonic metasurface offers position and polarisation dependency in the vacuum-field engineering of the exciton dynamics. On the meta-mirror, the decay dynamics of neutral excitons was controlled and suppressed depending on the position and polarisation, even approaching to the non-radiative decay limit. We expect that the meta-mirror-based decay dynamics engineering platform will pave a way in the development of advanced two-dimensional excitonics device.