The invention discloses an automatic concrete mixing information acquisition system and method for a roller compacted concrete dam, and aims to provide an accurate and automatic concrete mixing information acquisition system and method for the roller compacted concrete dam. The system comprises a mixing system master control microcomputer, a concrete production information acquisition module, a wireless signal sending device, a wireless signal receiving device and a server, wherein the mixing system master control microcomputer is electrically connected with the concrete production information acquisition module; the concrete production information acquisition module is electrically connected with the wireless signal sending device; the wireless signal sending device is in communication connection with the wireless signal receiving device; the wireless signal receiving device is electrically connected with the server. According to the system and the method, the concrete mixing information of the roller compacted concrete dam is accurately recorded and finely monitored in combination with time, so that the working strength of field construction supervisor is reduced, and meanwhile, security, accuracy and integrity of data are ensured.