The invention discloses a non-insulated band-stop filter, and the filter comprises at least one resonant cavity, and a trough line communicated with the interiors of the resonant cavities. Moreover, the resonant cavity and the interior of the trough line are provided with a metal line in a passing-through manner. The trough line is used for connecting the exterior of the band-stop filter and the adjacent resonant cavities in the band-stop filter. The metal line and the trough line are connected through at least one metal ridge. Only the bottom of the metal ridge is connected with the internal bottom surface of the trough line. According to the invention, the band-stop filter employs a ridge waveguide to achieve the coupling of the resonant cavities, does not need to employ a medium to support the metal line connected with an internal conductor of an axial line, is simple in machining, is low in machining cost, is convenient to debug, is far in parasitic stop band, is compact in structure, can work at the high-frequency microwave and millimeter wave, and can be widely used in various types of microwave electronic systems, especially the military and civil fields of radar, missile guidance and communication.