A gear selection and shifting actuating mechanism for an AMT gearbox, representing an Automated Manual Transmission, wherein the gear selection and shifting actuating mechanism comprises a gear shifting motor, a first transmission gear, a second transmission gear, a gear shifting screw, a push block, a plurality of shift blocks (11, 12, 13), a plurality of linear driving devices (8, 9, 10), and a plurality of shift forks (14, 15, 16), wherein the shift blocks (11, 12, 13), the linear driving devices (8, 9, 10), and the shift forks (14, 15, 16) have a same quantity and are provided corresponding to each other; wherein each shift fork (14, 15, 16) corresponds to a required gear of the AMT gearbox, wherein an output shaft of the gear shifting motor is provided with the first transmission gear, the first transmission gear is meshed with the second transmission gear, the second transmission gear is fixedly connected to the gear shifting screw, and the gear shifting screw is screwed to the push block; and the push block is provided with a plurality of through holes having the same quantity like the shift blocks (11, 12, 13), wherein the respective shift block (11, 12, 13) is driven to be movable by the corresponding linear driving device (8, 9, 10), wherein one end of the respective shift block (11, 12, 13) is connected to the corresponding linear driving device (8, 9, 10), and another end of the respective shift block (11, 12, 13) is inserted into one of the plurality of through holes, and wherein the respective shift block (11, 12, 13) and the corresponding linear driving device (8, 9, 10) are configured such that when a gear shifting is required the another end of the respective shift block (11, 12, 13) is aligned with a groove on the corresponding shift fork (14, 15, 16) after passing out of the respective one of the plurality of through holes. wherein the gear selection and shifting actuating mechanism comprises a gear shifting motor, a first transmission gear, a second transmission gear, a gear shifting screw, a push block, a plurality of shift blocks (11, 12, 13), a plurality of linear driving devices (8, 9, 10), and a plurality of shift forks (14, 15, 16), wherein the shift blocks (11, 12, 13), the linear driving devices (8, 9, 10), and the shift forks (14, 15, 16) have a same quantity and are provided corresponding to each other; wherein each shift fork (14, 15, 16) corresponds to a required gear of the AMT gearbox, wherein an output shaft of the gear shifting motor is provided with the first transmission gear, the first transmission gear is meshed with the second transmission gear, the second transmission gear is fixedly connected to the gear shifting screw, and the gear shifting screw is screwed to the push block; and the push block is provided with a plurality of through holes having the same quantity like the shift blocks (11, 12, 13), wherein the respective shift block (11, 12, 13) is driven to be movable by the corresponding linear driving device (8, 9, 10), wherein one end of the respective shift block (11, 12, 13) is connected to the corresponding linear driving device (8, 9, 10), and another end of the respective shift block (11, 12, 13) is inserted into one of the plurality of through holes, and wherein the respective shift block (11, 12, 13) and the corresponding linear driving device (8, 9, 10) are configured such that when a gear shifting is required the another end of the respective shift block (11, 12, 13) is aligned with a groove on the corresponding shift fork (14, 15, 16) after passing out of the respective one of the plurality of through holes.