The embodiment of the invention discloses a double connection secure communication method and device. The double connection secure communication method comprises the steps that first network connection with a server is established through a mobile data network, and second network connection with the server is established through a WLAN; a login request message transmitted to the server by a terminal is split into a first request data packet and a second request data packet; the first request data packet is transmitted on the first network connection, and the second request data packet is transmitted on the second network connection; and a first reply data packet is received on the first network connection, a second reply data packet is received on the second network connection, and the first reply data packet and the second reply data packet are combined into a login reply message transmitted to the terminal by the server so that user login can be completed. A situation that network attackers intercept complete communication messages of users in the network can be avoided by the scheme so that security of the login mode of the users and the server can be enhanced.