The invention relates to a yellow phosphorus combustion waste heat boiler sealed with a film wall and provided with an economizer, comprising a film wall hearth (4), a water-cooled base (9), a steam dome (1), a downcomer (10), a steam-water eduction tube (2), a yellow phosphorus burner (11) and an economizer (13), wherein, the film wall hearth (4) comprises a furnace roof cone (12), an upper header (3), a water-cooled wall (5), a lower header (7) and a furnace siege (8) from the top to the bottom in sequence; the steam dome (1) is arranged above the film wall hearth (4) and has an outlet communicated with the lower header (7) through the downcomer (10); the upper header (3) is communicated with a steam inlet of the steam dome (1) through the steam-water eduction tube (2); the economizer (13) is arranged on the top of the furnace roof cone (12) and is connected into the cylinder shape by an economizer tube (13.1) and an economizer flat steel (13.2); and the yellow phosphorus burner (11) is connected onto a water-cooled wall flat steel (5.2) and is positioned under the film wall hearth (4). The yellow phosphorus combustion waste heat boiler sealed with the film wall and provided with the economizer has the advantages of high efficiency of heat exchanging, high capability of waste heat absorption, strong corrosion resistance and reliable use.