The invention relates to the field of air inflation sealing machines, in particular to an automatic-inflation sealing machine for a buffer bag. The automatic-inflation sealing machine comprises a housing, a heating component, an air inflating component, a guide component and a transmission component; the transmission component comprises a transmission motor and two guide wheels; the air inflatingcomponent comprises an air blower and an air discharging pipe; the heating component comprises two heating blocks; the bottom of the upper heating block is arranged in a manner of clinging to the topof the lower heating block; the two guide wheels and the two heating blocks are in transmission connection with each other in a one-to-one correspondence manner by virtue of conveying belts; the two heating blocks are each provided with a belt groove for placing the corresponding conveying belt; the bottom of each belt groove is fixedly provided with a heating wire layer; and the two end faces ofeach heating wire correspondingly lean against the corresponding conveying belt and the bottom of the corresponding belt groove. The automatic-inflation sealing machine for the buffer bag, provided bythe invention, adopts a mode that the heating blocks, the guide wheels and the air discharging pipe are integrally connected; each heating block can be used as a heating source and can also be used as a guide part, so edge abrasion and deflection of each conveying belt are prevented, the service life of each conveying belt is prolonged, and the automatic-inflation sealing machine is compatible tomost of specifications of bag materials.