The utility model relates to a capacity controllable cable fault measuring and searching capacitor. A box is internally provided with n capacitor bodies, and n is greater than or equivalent to 3; a wiring sleeve E is arranged outside the box, and connected with one end of each of the n capacitor bodies; the other end of each of the n capacitor bodies is connected with one wiring sleeve L; the wiring sleeves L are arranged outside the box, and the number of the wiring sleeves L equals that of the capacitor bodies; and thus, the capacity of 2 or 4 or 6 or 8 microfarad can be provided. A proper capacity is selected according to the measured parameters as the fault-point resistance, the cable length and the fault property. The cable fault measuring and searching capacitor is convenient to carry, simple in wiring, and flexible and variable in capacity selection, and greatly improves the production efficiency.