The accuracy of engine detection data under the Internet of Things has become the technical bottleneck to realize the engine online fault diagnosis technology. Proposes a fusion algorithm of engine detection data under the Internet of Things based on fractional integration operator, discusses the application characteristics of fractional integration operator in signal processing, establishes a fusion processing model of engine detection data based on fractional integration operator, and realizes remote detection data high-precision measurement of engine remote detection information through the application of 0.5-order integration operator in fusion processing experiment of engine oil temperature, thus verifying the superiority of fractional integration operator in remote detection data fusion processing