A junction plate for a junction device of conveyor belt intended to connect two ends of at least one conveyor belt. The junction device is of a type having at least two junction plates fastened together with the ends of the conveyor belt by fasteners each including a head and an anchoring section. The junction plate includes first interfaces to cooperate with the heads of the fasteners and second interfaces to cooperate with the anchoring sections of the fasteners. The second interfaces are distinct from the first interfaces and include inserts incorporated at least in part in the junction plate. The first and second interfaces are arranged so as to form a succession of patterns which are repeated, and each pattern has as many first interfaces as second interfaces.