This paper proposes a novel self-consistent cosmological framework termed the Infinite Ontology and Temporal Single-Manifestation Parallel Universe Theory, constructed upon three transcendental first principles different from conventional binary physical logic and many-worlds interpretations. To resolve the inherent paradoxes of simultaneous parallel uperposition, temporal uniqueness, and infinite-finite dimensional conflict in modern cosmology and quantum interpretation, the theory establishes a three-state meta-logic system consisting of infinite noumenon, finite phenomenal manifestation, and meta-rule dimension. It rigorously deduces that the absolute infinite cosmic ontology contains all possible universal solutions, while any finite spacetime carrier cannot accommodate infinite possibilities, resulting in a core operational mechanism: all parallel cosmic branches exist latently at the meta-order level and can only present one single valid manifestation within finite temporal dimension at any given moment, rather than simultaneous coexistence. This model abandons empirical hypothesis dependence, adopts axiom-based closed-loop deduction, effectively reconciles quantum randomness, macroscopic temporal unidirectionality and subjective unique cosmic perception, and provides a new logically rigorous, dimensionally consistent theoretical paradigm for fundamental cosmology, parallel universe research and unified theoretical physics.