香火佛是先民渡海过台，多会请来故乡神明香火或体积小便于携带的佛像，祈求庇祐，多数香火佛都因日后香火兴盛，放入庙宇新塑的神明塑像内，原貌供奉已不多。
与一般随身佛应该相类似才是，其共同特征即将袖珍型佛像装在一小型的佛龛里面，方便随身携带念佛观像用。只是随身佛一般是佛教造像中的小型佛像称谓，通常配置有小佛龛；而香火佛则较偏向于民间信仰宗教的称谓，即传统庙宇里神祇造像，且是小尺寸的神像，一般也有配置小佛龛。
两者造像形式，同为小型尺寸特征，祇在佛龛造型上两者略有差异，常见随身佛佛龛材质大部分为金属、木、石…等材质制造，而香火佛则以木雕配制居多。也因此，留传下来的小型随身佛及佛龛，样式较多元；而香火佛的佛龛因属木制，保存不易，所以留下完整的香火佛含龛，相对少见，多数只剩下香火佛本体。
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