The invention relates to a circuit breaker and a contact finger assembly, a contact finger and contact finger sheets of the circuit breaker, and aims at solving the problem of a fussy installation process since each elastic contact sheet needs to be separately arranged when the contact finger is arranged on a contact base along the radial direction in the prior art. In order to solve the technical problem, the contact finger is formed by splicing at least two contact finger sheets; each contact finger sheet comprises an arc-shaped base body and a plurality of elastic contact sheets; the plurality of elastic contact sheets are vertically arranged on each arc-shaped base body; and the number of the contact finger sheets are much smaller than that of the elastic contact sheets for surrounding the contact finger, so that the required installation frequency of the contact finger sheets when the contact finger assembly is assembled is much smaller than that of the elastic contact sheets in the prior art; and the radial assembly efficiency of the contact finger assembly is greatly improved.