A flashlight holder assembly includes a supporting base device having a follower which includes a recess, and a flashlight has one end portion for engaging with the recess of the follower and for being supported in an erected position with the follower, the supporting base device includes a carrier, and the follower is pivotally attached onto the carrier and rotatable relative to the carrier between a folded position and an opened working position. The carrier and the follower each include one or more outwardly extended legs which are contactable with each other for limiting the follower to rotate relative to the carrier and for allowing the legs of the carrier and the follower to be rotated relative to each other.