A probe of a non-excavation guiding instrument comprises an antenna (12), a control circuit board (23) and a battery (13) used for supplying power to the control circuit board. The battery is arranged in a battery region (1), the control circuit board is arranged in an electronic region (2) connected to the battery region, a first insulation tube (11, 11') is arranged on the periphery of the battery, the antenna is arranged outside the first insulation tube and comprises a magnetic core (121, 121') and a coil (122) that is wound around the tail end of the periphery of the magnetic core and is connected to the control circuit board, the magnetic core comprises multiple magnetic core units (1211, 1211') that are bound on the outer side of the peripheral wall of the first insulation tube and are made of magnetic materials, and the magnetic core units are mutually insulated. According to the probe, the antenna and the battery are arranged on the outer side and the inner side of the insulation tube respectively, so the size of the antenna and the capacity of the battery can be synchronously increased to the maximum.
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