may be induced for each division module accordingly the humidification efficiency of the dry air may be improved by allowing the wet air to uniformly penetrate to the central part of the hollow fiber membrane bundle in each division module hereafter a device for adjusting a hollow fiber membrane density for a membrane humidification device of a fuel cell according to the present invention will be described in more detail below through each example fig1 illustrates an exemplary device for adjusting a hollow fiber membrane density for an exemplary membrane humidification device of a fuel cell according to a first example of the present invention as illustrated in fig1 the division module 110 may be constituted by a first division module 111 that may be divided into two sections and may be mounted to the interior of the wet air inlet 104 side of the housing 101 a second division module 112 that may be divided into four sections and may be mounted in a space between the wet air inlet 104 and outlet 105 of the housing 101 and a third division module 113 that may be divided into six sections and may be mounted to the interior of the wet air outlet 105 side of the housing 101 particularly on an inner diameter surface of the housing 101 a support stage 120 may be integrally formed to form a joint.