A harmonic vibration fitness machine, comprising: a machine body comprising a base and a platform, said base comprising an upward accommodating space, said platform being movable up and down above said accommodating space of said base; a movable plate set in said accommodating space and movable up and down relative to said base; a first drive unit set in said accommodating space, said first drive unit comprising a first motor, a first transmission shaft and two first transmission shaft bearing blocks, said first transmission shaft being connected to said first motor and drivable by said first motor to rotate, said first transmission shaft bearing blocks being respectively coupled to two opposite ends of said first transmission shaft and affixed to a top surface of said movable plate; two first linkages respectively pivoted to two opposite eccentric ends of said first transmission shaft of said first drive unit and affixed to said platform and said movable plate so that said first linkages are drivable by said first drive unit to move said platform up and down relative to said movable plate; a second drive unit set in said accommodating space, said second drive unit comprising a second motor, a second transmission shaft and two second transmission shaft bearing blocks, said second transmission shaft being coupled to said second motor and drivable by said second motor to rotate, said second transmission shaft bearing blocks being respectively coupled to two opposite ends of said second transmission shaft and affixed to said base; and two second linkages respectively pivoted to two opposite eccentric ends of said second transmission shaft of said second drive unit and affixed to said base and said movable plate so that said second linkages are drivable by said second drive unit to move said movable plate up and down relative to said base. a machine body comprising a base and a platform, said base comprising an upward accommodating space, said platform being movable up and down above said accommodating space of said base; a movable plate set in said accommodating space and movable up and down relative to said base; a first drive unit set in said accommodating space, said first drive unit comprising a first motor, a first transmission shaft and two first transmission shaft bearing blocks, said first transmission shaft being connected to said first motor and drivable by said first motor to rotate, said first transmission shaft bearing blocks being respectively coupled to two opposite ends of said first transmission shaft and affixed to a top surface of said movable plate; two first linkages respectively pivoted to two opposite eccentric ends of said first transmission shaft of said first drive unit and affixed to said platform and said movable plate so that said first linkages are drivable by said first drive unit to move said platform up and down relative to said movable plate; a second drive unit set in said accommodating space, said second drive unit comprising a second motor, a second transmission shaft and two second transmission shaft bearing blocks, said second transmission shaft being coupled to said second motor and drivable by said second motor to rotate, said second transmission shaft bearing blocks being respectively coupled to two opposite ends of said second transmission shaft and affixed to said base; and two second linkages respectively pivoted to two opposite eccentric ends of said second transmission shaft of said second drive unit and affixed to said base and said movable plate so that said second linkages are drivable by said second drive unit to move said movable plate up and down relative to said base.