The embodiment of the invention provides a cavity filter, which comprises a cavity, a first 
resonator, a second 
resonator, a third 
resonator, a main transmission path, a secondary transmission path and a 
coupling jumper, wherein the first, second and third resonators are sequentially arranged in the cavity; the main transmission path is led to the third resonator from the first resonator through the second resonator; the secondary transmission path is led to the third resonator from the first resonator; the 
coupling jumper is arranged between the first and third resonators along the secondary transmission path; and one end of the 
coupling jumper is assembled on the third resonator, and the other end of the coupling jumper is assembled on the cavity. The cavity filter is easy to assemble, so that 
work hours for 
assembly are reduced, requirements for the skills of an 
assembly operator are greatly lowered, and the error probability of the 
assembly operator is reduced. Moreover, the coupling jumper is formed by 
stamping a 
metal plate, so that the cavity filter is high in consistency and low in cost, the production cost and 
raw material purchasing cost of the product can be lowered by about 40 percent particularly in 
batch production compared with those of the conventional transmission zero structure, and the market competitiveness of the product is greatly improved.