The invention discloses a direct grid connected type photovoltaic power station circuit topological structure and belongs to the power and electronic technical field. The direct grid connected type photovoltaic power station circuit topological structure includes photovoltaic components, DC-AC unit modules and a control system; each DC-AC unit module comprises a first H-bridge converter, a second H-bridge converter, a third H-bridge converter and an isolation transformer, wherein the AC side of the first H-bridge converter is connected with one side of the isolation transformer, the other side of the isolation transformer is connected with the AC side of the second H-bridge converter, the DC side of the second H-bridge converter is connected with the DC side of the third H-bridge converter, and the first H-bridge converter and the second H-bridge converter are adopted as a whole and carry out simultaneous phase shifting control to realize soft switching actions of all switches. According to the direct grid connected type photovoltaic power station circuit topological structure of the invention, modular design is adopted. The direct grid connected type photovoltaic power station circuit topological structure has the advantages of easiness in expansion, cascade connection and high frequency.