The invention provides a counter and a fuel gas counting system. The counter comprises a counter support, a character wheel group, a driven wheel group, flower dial teeth, a transmission gear, a speed regulation gear and a duplicate gear. The character wheel group is fixedly arranged on the counter support; the character wheel group comprises a coaxially and parallelly arranged first character wheel, a red character wheel and a black character wheel; the driven wheel group is arranged on the counter support relative to the character wheel group in parallel, and the driven wheel group is meshed with the red character wheel and the black character wheel in the character wheel group; the flower dial teeth are fixed at the axial end, close to the first character wheel, of the counter support, and the flower dial teeth are meshed with the first character wheel to be used for driving the first character wheel to rotate; the transmission gear is fixed at the end, close to the first character wheel, of the counter support and coaxially connected with the flower dial teeth to drive the flower dial teeth to rotate; the duplicate gear is meshed with the speed regulation gear and the transmission gear separately, and the speed regulation gear drives the transmission gear to rotate through the duplicate gear. Accordingly, speed regulation can be achieved by adopting one speed regulation gear, operation is stable, and noise is low.