The utility model relates to an improved structure of a popcorn machine's lifting cover, which is characterized by a main support arranged at the opening of a can body and extending laterally, and a body at both ends of the main support can make the pivot of a cover body pivoted at both ends, and a spring piece is arranged above the two guide grooves, when one end of the pivot is in one of the guide grooves, the displacement of an adjusting piece can be adjusted, and the spring piece can be pressed down to limit the end of the pivot to be blocked. In the guide groove, the problem of the end of the pivot jumping out of the guide groove due to unrestricted is solved.一種爆米花機掀蓋改良結構，係有一主支架設於一桶體的開口處而橫向延伸，且主支架的兩端各有一座體可讓一蓋體之樞軸以兩端樞設，其一座體在二導槽上方有一彈片，當樞軸的一端在其中一導槽時，得以一調整件之位移，而使彈片下壓，以限制樞軸的端部被擋於所在導槽內，藉以解決樞軸的端部在導槽內因未受限制而跳脫的問題。
