A power cable insulating layer electrical state comprehensive detection device relates to the technical field of cable electrical state detection and adopts an embedded system architecture, and a power management module, a storage module, an acquisition module and a communication module are respectively arranged at the periphery of a CPU (Central Processing Unit); three high-frequency current transformers, four low-frequency current transformers and one power frequency phase sensor are connected through a BNC connector. The beneficial effects of the utility model are that the device achieves the parallel detection of three types of electrical parameters: cable partial discharge, sheath grounding current and transient grounding current, avoids the arrangement of various types of single detection equipment, facilitates the data management and the correlation judgment of all parameters, saves the cost, and is convenient to install.