The invention discloses a link block for a breaker and a machining method of the link block. The link block comprises an H-shaped link block body (1); through holes are respectively formed in two ends of the two edges of the H-shaped link block body (1); the through holes in two edges of one end are same in shape and size and the central lines are positioned at the same straight line; the two edges of the other end are respectively provided with a first through hole (2) and a second through hole (3); the axial sections of the first through hole (2) and the second through hole (3) are ladder-shaped; the central line of the round hole with smaller diameter of the first through hole (2) and the central line of the second through hole (3) are positioned at the same straight line. According to the link block with the structure and the machining method of the link block, a bar with an accurate shape size is used for replacing a steel plate material, during machining, the link blocks are cut according to the width size one by one, the shape cutting procedure which uses a linear cutting process and is time-consuming and high in cost is saved, and unnecessary waste caused by the scraps generated in the shape cutting of the steel plate is avoided.