The invention discloses a building sloping roof beam capable of predicating service life thereof. The building sloping roof beam comprises a building sloping roof beam structure body and an intelligent monitoring system arranged on the building sloping roof beam structure body. The system comprises a monitoring module, a data processing module, a safety state evaluation module, an early warning and alarming module and a simulation display module. The monitoring module comprises a wireless sensor network, a strain sensor assembly and a displacement sensor. The data processing module comprises an acquisition center station, a signal conditioner and a signal transmission device. The safety state evaluation module comprises a microprocessor. The early warning and alarming module comprises an analysis processor and an alarm. The simulation display module comprises a three-dimensional GIS simulation platform. Health of the building sloping roof beam structure is monitored in real time; residual life of the building sloping roof beam structure can be predicated according to monitoring data; and accurate and intelligent effects are achieved.