Realizing the dynamic sharing of multi-source survey data in power grids helps to promote data flow and professional collaboration in the field of power grid surveying. Traditional attribute encryption methods suffer from inefficiency and poor security when coping with dynamic access in the data sharing process. To address the above problems, we propose a dynamic sharing algorithm for grid multi-source survey data based on blockchain and proxy re-encryption. A proxy re-encryption algorithm is designed to ensure the security of data sharing. Next, the user rights dynamic adjustment algorithm is designed to make the blockchain authorized nodes dynamically adjust the data access rights according to the business progress, so as to improve the efficiency of dynamic data sharing. Experiments showed that the method described in this paper is better than existing data sharing schemes in terms of computational overhead and dynamic sharing efficiency, and has certain advantages in the dynamic sharing of multi-source survey data in power grids.