Provided is an online monitoring method for lubricating oil of a wind-
power transmission. The online monitoring method for the lubricating oil of the wind-
power transmission comprises the following steps that performance analysis is carried out on a 
tribology system of a gear case of the wind-
power transmission, and a comprehensive 
information monitoring method which is based on three aspects, namely an abrasion, a lubricating oil physical and chemical performance and 
pollution is proposed; an integral 
information monitoring system is established through testable analysis, and 
viscosity, water and an 
abrasive grain are adopted to be used as testable characteristics corresponding to the three classes of information of the abrasion, the lubricating oil physical and chemical performance and the 
pollution; by utilizing the embedded type integral sensor technology, real-time obtaining of the information is achieved; by adopting a TCP / IP 
network communication protocol, remote monitoring is achieved; a relation model of the abrasion, a 
lubrication oil product and the 
pollution are established, and inducements of the abrasion or lubricating malfunctions are speculated. Online perfect information obtaining is achieved, the analysis on origins of malfunctions is provided, the effective monitoring method for a running state of the gear case of the wind-power transmission is achieved, and according to positioning of an 
abrasive malfunction, an oil replacing suggestion and other maintaining suggestions, the important 
engineering significance for lowering the triology malfunction and prolonging the complete 
machine service life is achieved.