The invention discloses a method for detecting an inverter flat cable of a liquid crystal display television, which comprises the following steps: a: using a multivibrator to generate a pulse which is then used as a clock input of a frequency divider; b: connecting the output ends of the frequency divider to odd pin positions of the television inverter flat cable respectively, and simultaneously connecting the output ends of the frequency divider to even pin positions of the television inverter flat cable respectively after connecting the output ends with a phase inverter respectively; and c:connecting a light-emitting diode between each odd pin and each even pin on the other end of the television inverter flat cable to form a loop, and judging whether the light-emitting diode can emit light to make sure the on-off state of the television inverter flat cable. With the design of a detection circuit, the method can monitor the on-off circuit of the inverter flat cable of the liquid crystal display television effectively and can clear the faults of the flat cable very quickly so that the production efficiency is improved and the labor strength of workers is reduced.