The invention provides a water jet auxiliary rock breaking intelligent control system and method. The surrounding rock state and TBM tunneling main parameters are acquired, whether a water jet auxiliary rock breaking system is started or not is judged according to the surrounding rock state and the TBM tunneling main parameters, if the water jet auxiliary rock breaking system is started, water supply pressure, flow and pump set operating parameters of the water jet auxiliary rock breaking system are detected in real time, detected values are transmitted to a diagnosis module, when the monitoring parameters exceed set threshold values, it is judged that a fault occurs, the water jet auxiliary rock breaking system is switched off, and the operating efficiency and the safety and reliability degree of the water jet auxiliary rock breaking system are effectively improved.