The utility model belongs to the technical field of oil, gas well fracturing unit, a fracturing pump truck fluid end on-line monitoring system is related to, including being provided optical fiber sensor and probe power on the fracturing pump truck fluid end, the optical fiber sensor data pre processing device that is electrically connected, the data pre processing device optic fibre propagated sensation appearance that is electrically connected, probe power, data pre processing device, the equal connected system power of optic fibre propagated sensation appearance. Set up a set of fracturing pump truck fluid end health detection and failure analysis, forecast system, realize declaring in advance of fracturing pump truck fluid end operating mode. Reduce the fracturing in-process effectively and lead to the condition of construction failure to take place because of equipment trouble, avoid fracturing in-process personnel to enter high pressure line that higher-pressure region control fluid end operational aspect the caused risk of hurting sb. 's feelings of bursting, reduce the maintenance time of fluid end simultaneously, avoid the component transition maintenance that partial state is good, improve equipment life, reduction in production cost improves the operating efficiency.