Multi-layer serial food self-heating device

The utility model discloses a multi-layer serial food self-heating device which comprises a water storage box, a tray body and a water stop valve. The water storage box and the tray body are sequentially stacked from top to bottom; a water outlet runner is formed in one side of the bottom of the water storage box; the tray body comprises a plurality of layers of trays which are sequentially connected in series from top to bottom, a containing cavity for containing a heating bag and a food bag is formed in the bottom of each layer of tray, a first water inlet runner and a first water outlet runner are formed in the bottom of each layer of tray, and the first water inlet runner and the first water outlet runner are both communicated with the containing cavity; the first water outlet flow channel of the upper layer of tray is communicated with the first water inlet flow channel of the lower layer of tray, the first water inlet flow channel of the first layer of tray is communicated with the water outlet flow cha