With the development of communication technology and the prevalence of mobile smart devices, location-based services have been widely applied in various scenarios. However, the data typically provided by location-based services includes sensitive information such as personal identity, posing a risk of privacy leakage. Due to the limited resources of mobile smart devices, data is typically uploaded to semi-trusted cloud servers for storage and sharing, leading to the possibility of malicious access and abuse of data. To address these issues, we propose a location data sharing method based on blockchain and attribute-based encryption scheme. By combining blockchain technology with ciphertext-policy attribute-based encryption technology, the shared data is authenticated with trust while providing fine-grained access control. The immutability and traceability features of blockchain are utilized to enhance the security of the entire system. Furthermore, local differential privacy is employed to locally perturb the data before sharing, ensuring that individual privacy in location data remains uncompromised by untrusted third parties. Security analysis and performance evaluation indicate that our scheme is superior to the existing solutions.