The utility model discloses a short-circuit fault line selection device for a borehole cable. The short-circuit fault line selection device comprises a current signal generating circuit module, a plurality of current transformers, a plurality of signal conditioning circuit modules and a data processing display circuit module, wherein the current signal generating circuit module is composed of a sinusoidal signal generator and a voltage transformer; the current transformers are sleeved on a grounding wire of an outgoing cable; each single conditioning circuit module is composed of a lowpass filtering circuit module, a twin-T network wave trap module and an amplifying circuit module, which are connected in sequence; and the data processing display circuit module comprises an A/D (Analog/Digital) switching circuit module, a microprocessor module, a communication circuit module and an upper computer, which are connected in sequence. The short-circuit fault line selection device is simple in structure, reasonable in design, convenient to implement, low in cost, high in working reliability, strong in practicability and convenient to popularize and use, can be used for carrying out line selection on a short-circuit fault when a cable line operates and timely and accurately discovering a fault line and has a good use effect.