Disclosed is a time-domain transient electromagnetic wave well logging far-boundary detection method, related to the field of oil exploration, comprising the following steps: step 1: establishing a stratum model, designing a transmitting/receiving antenna combination mode; step 2: selecting a transient electromagnetic wave well logging pulse source excitation mode, transmitting a current into a stratum, performing excitation then cutting off a current source, measuring a pure secondary field in the stratum after the cutoff; step 3: acquiring a time-domain induced electromotive force; step 4: constructing a transient electromagnetic signal defining scheme, extracting information such as electric conductivity of the stratum and the boundary of the stratum; and step 5: performing boundary detections of transient electromagnetic wave well logging under different distances, inclination angles, and stratum resistivity conditions. Compared with a prior time-harmonic source electromagnetic wave well logging method, the method is free from interferences of a primary field while measuring, a pulse source comprises rich information of a wide frequency domain, the advantage of time-domain extraction of stratum information is provided, and a shorter source distance can be used to implement a remote detection of the boundary of the stratum for geosteering with well drilling and logging.
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