The invention discloses a developing method for an engineering paddy field. The method comprises the following steps: removing non-soil impurities on plot soil; stripping a plow layer having a depth of 20-25 cm of soil, and moving the stripped soil to vicinity of a plot for subsequent use; spraying sufficient water on the plow-layer-stripped plot, and performing filling and compaction on the plow-layer-stripped wetted plot by utilizing engineering machinery; spraying a prepared paddy field seepage control agent onto the plot and field ridges, and throwing an organic material; and backfilling the stripped and removed soil to the plot, and discharging water for normal tillage of the paddy field. The method disclosed by the invention produces a specific technical scheme through experimental optimization, and relates to a specific engineering operation scheme and an industrial formula of the seepage control agent for controlling a seepage rate, and a water seepage falling height detected by applicants is 3-10 mm/day; and the falling height fully satisfies requirements of a water seepage rate in the paddy field, and the method has better practicability and large-scale operability underthe premise of meeting national policies in China.