The invention discloses a tunnel advanced geological forecast system and belongs to the field of construction early-warning technologies. Through the system, the problem that comprehensive explorationand data analytical judgment cannot be performed on geological conditions in advanced geological forecast work at a current stage, and consequently normal progress of construction is influenced is solved. The system is technically characterized by comprising an advanced forecast module, a conventional forecast module, a data analysis module, an alarm module and a background monitoring module, wherein the conventional forecast module is used for conventional forecast exploration of a tunnel internal geological structure, and the output end of the advanced forecast module and the output end ofthe conventional forecast module are both wirelessly connected with an information collection module. Through the system, advanced detection on tunnel internal geology can be realized, safe progress of the construction is guaranteed, the phenomenon that tunneling speed is decreased due to unreasonable geology is avoided, therefore, it can be ensured that a construction unit passes through a bad geological section in a tunnel safely and smoothly, and the scientificity, safety and high efficiency in the construction process are guaranteed.