The invention provides a power transmission device state evaluation and risk analysis method and device based on multidimensional data and relates to the technical field of meteorological and electric power technology application. The method comprises steps of: acquiring and storing information data of a PMS production management system, information data of a power transmission and transformation monitoring system and information data of a meteorological bureau system through multidimensional heterogeneous data access; carrying out data preprocessing on the information data of the power transmission and transformation monitoring system and generating online monitoring effective data of a power transmission circuit; determining a power transmission device evaluation index according to the information data of the PMS production management system and the online monitoring effective data of the power transmission circuit, and determining an evaluation state corresponding to the power transmission device evaluation index according to a preset state evaluation strategy; and determining a risk index of the power transmission device according to the information data of the meteorological bureau system, the asset value of the power transmission device, the asset loss value of the power transmission device and the average fault rate of the power transmission device. According to the invention, the multidimensional data is comprehensively considered.