Embodiments of the present invention disclose a combiner. The combiner includes an external conductor (10) and an internal conductor (11), the external conductor (10) and the internal conductor (11) form at least two band-stop filters, and the at least two band-stop filters form at least two passbands; the at least two passbands include a first target combined passband and a second target combined passband, and a frequency of the first target combined passband is lower than a frequency of the second target combined passband; and a signal channel is included between a signal input end and a signal output end of a band-stop filter to which the second target combined passband belongs, the signal channel is formed by the internal conductor (11), and the internal conductor forming the signal channel includes a capacitor (13). Implementing the present invention can shorten a length of a main transmission line of the signal channel, and reduce a volume of the combiner.