Novel centralizer for well drilling string

The utility model discloses a novel centralizer for a well drilling column, relates to the technical field of well drilling tools, and provides the following scheme that the novel centralizer comprises an outer frame and a centralizing mechanism arranged in the outer frame, the centralizing mechanism comprises a fixing assembly and a buckle assembly, and the assembly comprises a first limiting column, a first sliding block and a first limiting block; a first sliding block is fixedly connected to the top end of the first limiting column, a first limiting block penetrates through the inner wall of the first sliding block, the first sliding block is fixedly connected with the first limiting block, and the first sliding block slides up and down along the outer wall of the first limiting block; and the second limiting column drives a circular limiting block, a positioning spring, a third limiting column and a trapezoidal limiting block to move, and the positioning spring drives the third limiting column and the tr