Abstract: Construction of agricultural information service system was fundamental guarantee.Internet of things plays an important role in the new information technology，and exists as a new revolutionary tide in the current era.In construction of agricultural informatization，extensive application of internet of things technology is a major opportunity.Construction of agricultural information service system was theoretically analyzed，taking the internet of things technology as breakthrough point，construction mode of agricultural information service system under internet of things environment was analyzed，aiming to give full play to role of internet of things technology in construction of agricultural informatization in China.