The invention relates to an optical band-pass and notching filter with adjustable bandwidth and central wavelength. An optical signal enters from a first port of a fiber circulator, is output through a second port, and is transmitted through an optical collimator and a combined beam expander to emit out to a blazed grating. Then, light beams of different wavelengths are dispersed through focusing conversion of double convex lenses, the light beams are focused to a vertically arranged reflector, a narrow band reflective area and a narrow band absorption area are reserved on the reflector, and light illuminating to the reflective areas of the reflector is reflected to return a second port of the fiber circulator according to an original path and then is output from a third port of the fiber circulator. Design of narrow band reflection and narrow band absorption of the reflector achieve two functions of optical collimator filtration and notching filtration. The function of adjusting the filter central wavelength is achieving by linearly adjusting the central position of the reflector. The sizes of the light beam and light spots focused on the reflector are changed by adjusting the beam expander, and adjustment of the bandwidth of the filter is achieved. The optical band-pass and notching filter with the adjustable bandwidth and central wavelength is simple in structure, convenient to control, low in manufacturing cost and stable in performance.