To provide a farm field map generation system capable of generating an excellent farm field map even if positional information of an agricaltural machine is not obtained temporarily.SOLUTION: A farm field map generation system includes: a data acquisition part for acquiring at least one piece of information as crop information from among operation information, farm field information, and crop information; a positional information acquisition part capable of acquiring data acquisition positional information; a polygon constructing part for constructing a polygon; a data assignment part for assigning acquisition data to each polygon; and a farm field map generation part for generating a farm field polygon map as an agglomeration of the polygon. When data acquisition position information is not acquired, the polygon constructing part constructs, in a complementary manner, the polygon corresponding to the timing in which the data acquisition position information is not acquired based on the polygon corresponding to the timing before and after the timing in which the data acquisition position information is not acquired, and the data assignment part assigns the acquisition data to the polygon constructed in the complementary manner.SELECTED DRAWING: Figure 5
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