The invention belongs to the technical field of tobacco curing and blending, and particularly relates to a method, system and platform for monitoring the tobacco ash hanging degree of a curing barn. The method comprises the following steps: acquiring basic data of real-time conductivity and moisture content of tobacco leaves in a curing barn; analyzing and processing the acquired basic data of theconductivity and the moisture content in real time; generating tobacco leaf ash hanging degree data information; and sending the tobacco leaf ash hanging degree data information to an intelligent monitoring terminal in real time. Data information such as moisture and temperature of tobacco leaf curing in the curing barn can be mastered at the first time, corresponding tobacco leaf ash hanging degree data information can be generated in real time through the data information, and the tobacco leaf ash hanging degree data information is monitored through the intelligent monitoring terminal. Thetobacco curing barn is simple in structure and convenient for background workers or managers to master the parameter conditions in the curing barn at the first time, and can master the tobacco ash hanging degree in real time, so that the tobacco curing quality is ensured, time and labor are saved, and wrong adjustment of the temperature of the curing barn due to wrong judgment on the tobacco stateby traditional naked eyes is avoided.