The invention provides a light thin layer bottom water thickened oil displacement composite development method which comprises the steps that 1, two horizontal wells are arranged on a bottom water layer and a pure oil layer respectively, steam is injected into the horizontal well in the bottom water layer, and the horizontal well in the pure oil layer produces; 2, continuous steam injection is conducted in the horizontal well of the initial bottom water layer, external water is prevented from invading, meanwhile, the water layer is heated, and a production well in the oil layer conducts huff and puff production, and the oil layer is heated; and 3, after the oil-water layer is heated to a certain degree, steam is continuously injected into the bottom water layer, and oil is continuously extracted from the oil well in the oil layer. According to the shallow-thin layer bottom water thickened oil displacement and leakage composite development method, the thickness of a bottom water layer is required to be thin; the steam for heating the bottom water layer only accounts for about 3-5% of the injected whole, by controlling the bottom hole flowing pressure of the edge steam injection well, the edge bottom water is prevented from invading and overflowing to an external water body at the same time, and by adjusting the production-injection ratio of the steam injection well and the production well, expansion of a steam cavity is controlled, so that the crude oil yield is increased.