An adhesive tape dispenser includes a tape roll housing holding a cutter blade, a protective member mounted in the tape roll housing and movable relative to the tape roll housing to a first position to expose the cutter blade, a front cover mounted in the tape roll housing in such a manner that the front cover is prohibited from being opened when the protective member is in the first position, or can be opened or received when the protective member is moved to a second position. Further, the cutter blade can be mounted in a cutter holder that is installed in the tape roll housing. With the slidable or biasable design of the protective member and the front cover, the user can selectively expose the cutter blade or enable the cutter blade to be blocked.