The invention relates to an application of a porphyrin derivative in an interface modification aspect of a hole transport layer/perovskite layer in an inverted perovskite solar cell. A device structure is an ITO/hole transport layer/perovskite layer/electron transport layer/cathode. Porphyrin is used for an interface of the hole transport layer/perovskite layer in the perovskite solar cell. Firstly, the shape and form of the perovskite layer can be adjusted, the defect density in a film is reduced and the quality of the perovskite layer is improved; and secondly, a porphyrin interface modification layer is introduced, transportation of electrons from perovskite to the hole transport layer can be effectively blocked, and meanwhile, injection and transportation of holes from the perovskite to the hole transport layer are facilitated, thereby facilitating improvement of the device efficiency. Furthermore, since the solubility of the porphyrin is relatively good, the porphyrin can be introduced into the perovskite solar cell through a solution spin-coating method, the operation is very simple and the repeatability is good.