The invention discloses a centroid detection device for an absolute gravimeter falling body and a relates to the centroid detection device. In a structure of the centroid detection device, an electronic scale (9) and a screw cushion block (4) that are interconnected are arranged on a base plate (7) in a left-and-right manner, a first knurled screw (8-1) on a support plate (5) is placed on the electronic scale (9), and second and third knurled screws (8-2, 8-3) on the support plate (5) are placed in a taper hole of the screw cushion block (4); an axial positioning baffle plate (1), a height heel block (6) and a V-shaped groove block (3) are orderly arranged on the support plate (5) from left to right; an absolute gravimeter (2) is placed on the height heel block (6) and the V-shaped groove block (3). The centroid detection device for the absolute gravimeter falling body solves a problem that a conventional centroid detection device for the absolute gravimeter falling body is complex in structure and is difficult to process and assemble, and a technical problem that the conventional centroid detection device is complex to operate and high measurement precision cannot be guaranteed when the conventional centroid detection device is used for detecting a centroid of the absolute gravimeter falling body is addressed.