The invention discloses an adjustable radial pin for a steam turbine, and relates to a radial pin. The invention aims to solve the problem that in the existing unit installation process, the process and the secondary installation of the process pin are easy to cause. According to the adjustable radial pin, a radial pin main body comprises a main body part and an adjusting part, wherein the main body part is installed in an outer sleeve; an adjusting part is a boss formed by cutting two side walls of the two sides of a cylinder, and a groove is formed in each of two opposite planes of the boss;cushion blocks are matched with the grooves, and the adjusting part is matched with the inner sleeve through the thickness of the grinding cushion blocks; and tightening screws are used for fixing the cushion blocks. The adjustable radial pin has the advantages of being clear in structure, easy to process and adjust, high in machining precision, better in matching effect and small in field adjustment amount; and the cushion blocks are fixed to the adjusting part of the radial pin main body by the fastening screws, so that the dismounting and mounting are convenient, and the adjusting processis more rapid and convenient.