The invention belongs to the technical field of cable installation, particularly relates to a bus duct and a bus duct joint thereof. Aiming at the problems that the resistance of a bus duct at a jointis large, heating is easy to occur, particularly, the temperature of the core-penetrating bolt is easily increased, and some core-penetrating bolts need to be fastened regularly, the following schemeis provided: the bus duct comprises two main bodies, conducting bars are arranged in the two main bodies, inclined surface openings are formed in the top ends and the bottom ends of one sides of theconducting bars, protective sleeves are arranged outside the two main bodies, and circular through holes are formed in the top ends and the bottom ends of the protective sleeves. According to the invention, the moving plate is moved through the fastening bolts, so that an insulating sheet moves until the two sides of each conducting strip make contact with the conducting bar, the fastening bolts continue to be twisted, the conducting strips begin to be bent and are tightly attached to the openings of the slopes of the conducting bars, the contact area is increased, every two adjacent conducting strips clamp the conducting bar, the fastening bolts are located on the two sides of the protective sleeve, the fastening bolts are not prone to temperature rise, and the stability of the fasteningbolts is improved.