The invention discloses a portable cable checking detector, and the detector comprises a box body. The interior of the box body is provided with a cable checking detection circuit board. The box body is provided with a plurality of cable checking visual strip groups, and the box body is also provided with a cable checking manual switch and a charging hole. Each cable checking visual strip group comprises a start end wiring terminal, a self-checking display lamp, a cable checking display lamp, and a tail end wiring terminal. The cable checking detection circuit board comprises a power supply module, a power control module, and a cable-checking self-checking and detection module. A power connection port of the power supply module is used for connecting the commercial power supply, and a power supply port of the power supply module is connected with a power input end of the power control module. A supply end of the power control module is connected with a wiring terminal of the cable-checking self-checking and detection module. The tester can save a large amount of time and labor of the detection workers, and improves the reconstruction and capital construction efficiency of a power distribution network and a transformer station project.