The present invention circulates the hot water evenly over the entire inside of the hot water tank, and the seeds introduced into the hot water are gradually lowered in the hot water tank so that the seeds are exposed to the hot water at a uniform temperature for a uniform time necessary for disinfection. Disinfect the seeds in the hot water tank by backflow of compressed air when the transfer pipe is temporarily blocked by seeds during the process of uniform disinfection of the seeds and transfer of the disinfected seeds to the outside by compressed air. The present invention relates to a seed automatic hot water sterilizer which produces seeds of higher quality by not causing disturbances. Seed automatic hot water sterilizer of the present invention disinfection container (10)； A heating heater (11) for heating the water in the sterilization container (10)； A hot water tank 20 provided inside the disinfecting container 10 and having a plurality of through holes 21 formed in a water surface portion thereof； A water circulation device for supplying heated water of the disinfecting container 10 into the hot water tank 20； A large diameter storage pipe 40 connected to the lower end of the hot water tank 20 and a transfer pipe 50 extending from the bottom of the sterilization container 10 to the upper end to transfer the seeds of the storage pipe 40 to the outside, And a seed transfer device for discharging the compressed air from the air pump 61 to the inlet of the transfer pipe 50. The automatic hot water disinfector is installed at the center of the inside of the hot water bottle 20, An air discharge cylinder (100) having a seed outlet (101) formed therein and having a height extending up to the water surface and having an upper end opened and communicating with the outside air； An upper wire net 110 installed on an upper surface of the air discharge cylinder 100 to prevent inflow of seeds injected from the upper side； A plurality of water spouting holes 121 are for
