The invention discloses a collaborative location privacy protection method based blockchain. Firstly, a reputation mechanism is designed, transaction behaviors are stored through blockchain, and once dishonest behaviors are found, reputation value scores of the dishonest behaviors are reduced; secondly, the safety is analyzed by using a game theory; in addition, during the calculation of the probability forwarding matrix, the utility cost and the service quality of user forwarding and the expected distortion error of an attacker with background knowledge are considered, so the privacy level of the user is improved, and the service quality of the user is ensured; finally, according to the invention, a simulation experiment and security analysis show that the experiment can effectively prevent the self-benefit behavior of the user in the cooperation process, and can also promote the user to actively participate in forwarding. The position privacy protection effect of the user can be improved, and inference attacks are prevented.