The invention provides a band-pass type tunable optical filter array and belongs to tunable optical filters, wherein the band-pass type tunable optical filter array solves the problem that existing tunable optical filters cannot simultaneously meet the requirements for array integration, flat pass-band characteristics and grid-free tuning. The band-pass type tunable optical filter array comprises an optical fiber array, a micro-lens array, a polarization transformation assembly, a beam expanding prism, a cylindrical lens, a diffraction grating, a Fourier lens and an LCOS chip which are arranged on an optical path in sequence. The band-pass type tunable optical filter array is based on the LCOS chip, the free space optics structure is adopted, the structures and parameters of the micro-lens array, the prim, the cylindrical lens, the lens and other optical elements are designed appropriately, pixel regions of the LCOS chip are partitioned and arranged reasonably, and therefore the band-pass type tunable optical filter array is simple and compact in structure, supports wavelength grid-free tuning design, planarization design of pass-band characteristics and array integration design, has good heat stability and polarization stability, meets development requirements of next-generation all-optical networks, and can be widely applied to an optical fiber communication system.