Provided are a control structure and control method for a paper feed roller and a printing device having such a control structure. The control structure for the paper feed roller comprises: a paper feed support (1), a paper feed gear support (2), a carbon belt gear support (3), a paper feed roller (4), a first position limiting member (7), and a second position limiting member (8). A paper feed gear (21) and a paper discharge gear (22) are provided on the paper feed gear support. The paper feed support moves between a non-working position and a working position under the action of a first power source. When the paper feed support is located at the non-working position, the paper feed support abuts against the second position limiting member, and the second position limiting member drives the paper feed gear support to swing to an idle position where the paper feed gear is separated from the paper feed roller; moreover, the carbon belt gear support abuts against the first position limiting member under the action of the first power source, and the first position limiting member and the paper feed gear support are made to be in limit matching along the swing direction to limit the paper feed gear support at the idle position; when the paper feed support is located at the working position, the paper feed support is separated from the second position limiting member, and the paper feed gear support swings, under the action of a second power source, to a linkage position where the paper feed gear or the paper discharge gear is meshed with the paper feed roller. Such a control structure would not misfeed, into a printing area, paper that is not required for working.