The invention discloses a low-noise mechanism and a lock with the same. The low-noise mechanism comprises a rack (1). One end, in the length direction, of the rack (1) is mounted on a spring bolt component (10); the rack (1) is meshed with a transmission gear (6); an energy-storage flywheel (7) is fixedly arranged on and is coaxial with the transmission gear (6). The lock with the low-noise mechanism comprises a lock shell, the spring bolt component (10), a driving component and the low-noise mechanism. The lock shell is provided with a faceplate. A spring bolt hole is formed in the faceplate. The spring bolt component (10) comprises a spring bolt and a guide plate fixedly connected with the spring bolt. The driving component is used for driving the spring bolt component (10) to extend or retract. By the low-noise mechanism, the technical problem that noises are generated due to the fact that abnormal sounds are caused during collision between the spring bolt and a pin hole of a door fame when the spring bolt extends in the prior art is solved.