In this study, the vectorial properties of spatiotemporal optical vortices are investigated by combining them with polarization singularity, and a spatiotemporally polarized singular light field is proposed, which is a polarized singular light field in the spatial domain and features vortex phases in the spatiotemporal domain. Using the superposition of two orthogonal circularly polarized beams, three types of spatiotemporally polarized singularities, namely, C-point, V-point, and higher-order spatiotemporally polarized singularities are realized. The effect of the spiral phase of the spatiotemporal domain on the spatiotemporally polarized singularities in the spatial domain is investigated. The results show that the spiral phase must exist in the same plane as the spatiotemporal domain of the two superimposed beams; otherwise, the polarized singular structure in the spatial domain will be destroyed. This study provides better understanding into the physical properties of spatiotemporal optical vortices and provides a theoretical basis for their applied research.