The invention discloses a high-order simulation N-channel active band-pass filter with tunable frequency. The filter comprises an active band-pass filter body, wherein the active band-pass filter body comprises M N-channel filter groups, 2*(M-1) gyrators and a clock generator. Two single-end active filters are combined to form a complete differential double-end N-channel active band-pass filter, and even harmonics are eliminated; each gyrator comprises an operational transconductance amplifier based on a phase inverter, and can increase the gain of the filters effectively; and the clock generator is used for supplying periodic sampling pulse sequence to the N-channel active filter, so that the center frequency of the filter is only determined by the clock frequency. According to simulation of a 6-order 8-channel active band-pass filter, a simulation result shows that the variable range is 0.2 G-2.0 G, so that the band-pass filter has bandwidth tunable center frequency, besides, the band-pass filter has the characteristics of good stability and low sensitivity and has wide application in the field of communication systems.