Disclosed are a dual-connection security communication method and apparatus. The method comprises: establishing a first network connection with a server by means of a mobile data network, and establishing a second network connection with the server by means of a WLAN; splitting a login request message sent, by a terminal, to the server into a first request data packet and a second request data packet; sending the first request data packet on the first network connection, and sending the second request data packet on the second network connection; and receiving a first answer data packet from the first network connection, receiving a second answer data packet from the second network connection, and combining the first answer data packet and the second answer data packet into a login answer message sent, by the server, to the terminal, so as to complete user login. The present solution prevents a network attacker from intercepting a complete communication message of a user in a network, thereby improving the security of login modes of the user and a server.