An exercise machine which provides back-and-forth movement and vibration comprising: a base which is a frame body divided into a first side portion, a middle portion and a second side portion; two sides of the middle portion of the base provided with a first support and a second support respectively; a loading platform adapted for users to stand thereon and provided with a shaft disposed close to one side thereof; a motor disposed on the first side portion of the base; a first transmission device which is arranged at about the middle portion of the base and composed of a first axial rod, a first turning wheel disposed on one end of the first axial rod, and at least one first eccentric wheel arranged at the other end or a middle portion of the first axial rod; the motor being connected to the first turning wheel by a first belt; characterised by a second transmission device which is disposed on the second side portion of the base and having a second axial rod, a second turning wheel mounted on one end of the second axial rod, a second eccentric wheel arranged close to a middle portion of the second axial rod and enclosed in the connecting part, and a baring mounted on the connecting part and pivotally connected to the shaft of the loading platform; the first turning wheel being connected to the second turning wheel by a second belt; and a first pivot part and a second pivot part arranged at two sides of a middle portion of the frame body respectively, located opposite to each other, and pivotally connected to two sides of the middle portion of the base respectively; thereby while the second eccentric wheel is rotated, the loading platform is synchronously driven to move back and forth with reciprocating vertical displacement on the first support and the second support of the base at one side of the base like a seesaw owing to the baring connected to the shaft; wherein the motor drives the first transmission device to generate vibration; the motor simultaneously drives the second transmission device to make the loading platform to have back-and-forth movement; the first transmission device makes the base generate vibration which are delivered to users; the back-and-forth movement of the loading platform driven by the second transmission device are transmitted to users' feet and further torsos. a second transmission device which is disposed on the second side portion of the base and having a second axial rod, a second turning wheel mounted on one end of the second axial rod, a second eccentric wheel arranged close to a middle portion of the second axial rod and enclosed in the connecting part, and a baring mounted on the connecting part and pivotally connected to the shaft of the loading platform; the first turning wheel being connected to the second turning wheel by a second belt; and a first pivot part and a second pivot part arranged at two sides of a middle portion of the frame body respectively, located opposite to each other, and pivotally connected to two sides of the middle portion of the base respectively; thereby while the second eccentric wheel is rotated, the loading platform is synchronously driven to move back and forth with reciprocating vertical displacement on the first support and the second support of the base at one side of the base like a seesaw owing to the baring connected to the shaft; wherein the motor drives the first transmission device to generate vibration; the motor simultaneously drives the second transmission device to make the loading platform to have back-and-forth movement; the first transmission device makes the base generate vibration which are delivered to users; the back-and-forth movement of the loading platform driven by the second transmission device are transmitted to users' feet and further torsos.