The utility model discloses a full-section geological drill bit which comprises a steel cylinder body (1), a rolling gear mounting seat (5) and a rolling gear (2), the wall thickness of a front end part (11) of the steel cylinder body (1) is gradually reduced along the drilling direction, and rock breaking bodies (6) are arranged on the inner surface and the outer surface of the front end part (11); an external thread (7) is arranged at the rear end part of the steel cylinder body (1); the rolling gear mounting seat (5) is positioned in the steel cylinder (1) and is fixedly connected with thesteel cylinder (1); wherein the rolling gear (2) is rotatably sleeved on the rolling gear shaft (3), one end of the rolling gear shaft (3) is fixedly connected with the steel cylinder body (1), and the other end of the rolling gear shaft (3) is fixedly connected with the rolling gear mounting seat (5); and a rock breaking body (6) is arranged on the outer surface of the rolling gear (2). The geological drill bit is favorable for arranging more rock breaking bodies, high in drilling speed and capable of drilling rock strata of various grades, and the service life of the drill bit is longer thanthat of other similar drill bits, so that frequent drill lifting operation is reduced, and the labor intensity of operators is reduced.