The invention relates to a novel packaging air sac without hot streak pints in an inflation channel. The air sac comprises two cavity films, the boundaries of which are sealed; the air sac further comprises two valve films which are arranged between the two cavity films; first heat seal lines are arranged at the top ends of the valve films for the valve films and the cavity films; the cavity films, from the first heat seal lines to the top ends, form the inflation channel, and the cavity films and the valve films, from the first heat seal lines to the bottom ends, form a sac body; heat-resistant layers are arranged at the first heat seal lines of the two valve films, and the heat-resistant layers are arranged between the two valve films; an inflation opening is formed on the inflation channel. According to the packaging air sac provided by the invention, the top ends of the valve films are adhered together with the cavity films through the first heat seal lines and the heights, protruding out of the first heat seal lines, of the valve films are strictly controlled, so that when the inflation channel swells, the inflation channel can be opened by directly pulling the valve films, gas enters conveniently, and a design of applying the hot streak points in the inflation channel in the prior art is cancelled. Therefore, the machining process is simpler and the rejection rate is reduced.