Concave spherical surface sphere center entity tool

The utility model discloses a concave spherical surface sphere center materialization tool which comprises a contact surface seat and a materialization rod, an annular protrusion used for abutting against a concave spherical surface to be measured is formed at the bottom of the contact surface seat, and a center penetrating hole located in the center of the annular protrusion is formed in the contact surface seat. The lower end part of the materialized rod is arranged in the central through hole of the contact surface seat in a penetrating manner, the materialized rod is of a telescopic rod structure with adjustable length and lockable length, a materialized ball head is arranged at the top of the materialized rod, a contact surface ball head is arranged at the bottom of the materialized rod, and the ball center of the materialized ball head and the ball center of the contact surface ball head are both located on the central axis of the materialized rod; and a locking structure for locking the materialized ro