The present disclosure provides a bidirectional TDI line image sensor. The bidirectional TDI line image sensor according to one embodiment of the present invention comprises: a pixel unit, which has N line sensors having M CCDs arranged in a line and being arranged in a scan direction, moves, in the scan direction, charges accumulated in the respective columns of the line sensors, and accumulates the same; and an output unit for parallelly receiving as inputs the charges accumulated in the pixel unit from the respective columns, performing analog-to-digital conversion on and storing the charges, and then sequentially outputting same.