The invention discloses an Ethernet secret access prevention double-link communication control system and method. The Ethernet secret access prevention double-link communication control system is characterized by comprising a data request side, a data control side and a device side, the data request side sends request data to the data control side after the request data are encrypted, the data control side analyzes the request data and is connected with a device of the assigned device side, the device of the device side receives a connection request of the data control side and sends the connection result to the data request side through the data control side, if connection is successful, the data request side encrypts and sends data to be transmitted to the device side through the data control side or the device side sends data to the data control side, then encrypts the data and sends the data to the data request side. The secure communication link is established through the control link and data link double-link communication and the DES and RSA dual encryption means, the physical device access security and the data transmission security are ensured, and the data secret leakage and the access risk of third-party software can be effectively reduced.