The AC/DC hybrid distribution network with a high proportion of distributed generation access is an important transitional form for the development of the future distribution network. With the development of power systems, the requirements for the reliability of the distribution network have increased. This paper proposes a method of collaborative optimization planning and design for an AC/DC hybrid distribution network framework and distributed generation, a method that considers reliability. In scenario construction, the correlation and timing of output of each distributed generation and the timing of each load power are considered. A comprehensive reliability evaluation system considering steady- and fault-operation is established from the operational characteristics of AC-DC hybrid distribution network. This is done by establishing the relationship between the reliability indicators, where the reliability and economic indicators are objectively processed in a unified dimension. A two-layer collaborative optimization strategy is designed for AC-DC hybrid distribution network structure and distributed generation access capacity. At the same time, a complete line fault sampling model is established. The superiority and effectiveness of the proposed method are verified by an example of the optimization planning of a modified IEEE 33-bus AC-DC hybrid distribution network. This work is supported by the National Key Research and Development Program of China (No. 2018YFB0904703).