The invention discloses a non-contact type concrete resistivity testing instrument. The non-contact type concrete resistivity testing instrument is characterized by comprising an inner working core barrel and an outer working core barrel, wherein the inner working core barrel and the outer working core barrel are assembled into a double-shell barrel body structure by adopting bolts; the double-shell barrel body structure is provided with a ring-shaped iron core and a current testing instrument which respectively surrounds opening ends of an upper barrel and a lower barrel of the inner working core barrel and the outer working core barrel, the inner wall of the inner working core barrel and the outer wall of the outer working core barrel; the inner wall of the outer working core barrel is provided with an induction coil which is connected with a voltage testing instrument outside the outer working core barrel by a wire; and the iron core on the outer wall of the outer working core barrel is wound with a primary coil which is connected with a power supply outside the outer working core barrel by a wire. The non-contact type concrete resistivity testing instrument disclosed by the invention is based on the electromagnetic mutual inductance principle, can be used for testing the resistivity when being buried and cast in concrete, and is suitable for monitoring the change of the resistivity of the concrete for a long time and in real time.