A muscle training apparatus with muscle strength detecting function includes a first supporting shell, a plurality of membrane pressure-sensing units, an arithmetic processing unit and an elastic covering unit. The first support shell is spherical and has a first outer surface and a first containing space. The membrane pressure-sensing unit is disposed on the first outer surface of the first support shell. The arithmetic processing unit is disposed in the first containing space and electrically connected to the membrane pressure-sensing unit. The elastic covering unit covers the first support shell.