Provided in the present application are client premise equipment (CPE), a CPE mounting bracket, and a CPE system, the CPE comprising: a housing, an omnidirectional antenna, a communication module, a printed circuit board (PCB) and a heat sink. The omnidirectional antenna is connected to an input end of a communication module, and an output end of the communication module is connected to the PCB; an output end of the PCB is connected to an Ethernet cable, and the PCB is disposed on the heat sink, wherein heat is dissipated by means of the heat sink; the communication module is used to convert a received radio frequency signal into a digital signal; the housing is a tubular structure having an open lower end, and the omnidirectional antenna, the communication module and the PCB are disposed inside of the housing; the heat sink is arranged at the lower end of the housing, and a through hole for the Ethernet cable to penetrate is provided on the heat sink; and the gap between the Ethernet cable and the heat sink is sealed. The CPE may be detachably connected to the CPE mounting bracket, and the omnidirectional antenna is arranged so as to achieve 360-degree coverage for the CPE. With the present application, there is no need for an expert to adjust the antenna direction in the installation process, so that the installation process is simple, and the installation cost is low.