With the promotion of the ubiquitous power internet of things, there are more and more new power equipment connected to the distribution network, such as kinds of distributed generation, energy storage system, electric vehicles and so on. So the traditional distribution network will be greatly changed in the future, which makes it difficult for original planning technology to meet the requirements of the distribution network for power supply security and stability. So based on the above situation, the active distribution network planning technology is reviewed, which is applicable to the situation of ubiquitous power internet of things. And current research about load forecasting and generation forecasting, siting and sizing, and multi-dimensional evaluation of planning schemes in active distribution network are reviewed. It also puts forward some difficulties and challenges that the distribution network planning technology may encounter under the new situation, and summarizes and evaluates a variety of complex theories and optimization algorithms. Finally, the summary and the future prospect of active distribution network planning technology under the new situation are given. This work is supported by National Natural Science Foundation for Young Scientists of China (No. 51707139), Fundamental Research Funds for the Central Universities (No. WUT:191011005), and Science and Technology Project of State Grid Hunan Electric Power Company (No. 5216A018000J).