Heterogeneous aggregate signcryption can not only achieve the confidentiality and unforgeability of information transmission between different cryptosystems, but also reduce the cost of data communication. Combining with the characteristics of vehicular networks, we present a heterogeneous aggregate signcryption scheme from certificateless cryptography to identitybased cryptography, and adopt different system parameters to enhance the security of the system. The scheme can simultaneously verify multiple messages and keep the sender's identity anonymous, which can effectively secure the privacy of users. Moreover, we prove the indiscernibility and unforgeability of the scheme under the random oracle model. Data comparison experiments show that compared with the schemes of the same type, the proposed scheme is effective in reducing communication cost and more suitable for vehicular networks.