The invention discloses a gain enhancement type N-channel active band-pass filter adopting a differential clock. The gain enhancement type N-channel active band-pass filter comprises an N frequency-division ring counter, a differential clock circuit and an operational transconductance amplifier, wherein the N frequency-division ring counter is formed by annularly connecting N D triggers; a sampling pulse sequence is output from the Q end of each D trigger; the differential clock circuit comprises N switch branches and N/2 capacitors, and every two switch branches and one capacitor constitute an H-shaped circuit structure; switches in the upper left position and the lower right position of each H-shaped circuit structure are simultaneously connected with the Q end of one D trigger of the N frequency-division ring counter, and switches in the lower left position and the upper right position of each H-shaped circuit structure are simultaneously connected with the Q end of another D trigger of the N frequency-division ring counter; two ends of the operational transconductance amplifier are connected to two ends of the differential clock circuit respectively. The gain enhancement type N-channel active band-pass filter has the characteristics of large adjustable range of center frequency and large gain.