The invention discloses an underground crude oil transporting pipeline tiny leaking accurate locating monitoring method and device. Temperature sensor nodes are arranged in an insulating layer of the crude oil transporting pipelines to detect temperature change information and transmit the temperature change information to wireless gateway nodes, the wireless gateway nodes transmit information to a remote control center, the remote control center analyzes and processes the information and judges leaking positions. With the underground crude oil transporting pipeline tiny leaking accurate locating monitoring method and device, tiny leaking of the crude oil transporting pipeline can be accurately located and monitored, and the low-power design of the temperature sensor nodes and the layout scheme of the topological structure are capable of prolonging service life of the overall monitoring system. When the system monitors leakage of pipelines, two pipeline valves on the upper and the lower streams nearest to the leaking positions are automatically closed to reduce leakage of crude oil.