A grinding package fitted on a robotic arm, comprising: a main body formed with a first space, a second space, a communicating hole communicating the first space to the second space, an intake channel, an exhaust channel, an opening of the first space and an opening of the second space being respectively located on each of two parallel sides of the main body; a pneumatic motor including a motor body provided within a working region of the first space,, and a transmission shaft connected to the motor body while extended from the second space through the communicating hole; and a grinding tool facing the second space and being joined to the transmission shaft, the grinding tool being turned by the transmission shaft, which is turned by impelling the motor body by the working gas; wherein the grinding package is characterized in that: the main body further comprises a connecting wall provided within the first space, the connection wall separates the first space into an intake region communicated to the intake channel and the working region communicated to the exhaust channel, wherein the connecting wall is not provided at the center of the first space, and the intake region is smaller than the working region, and wherein the connecting wall is provided with a ventilation hole communicating the intake region to the working region; and the grinding package further comprises a bridging part combined with the main body and the robotic arm, the bridging part closes off the first space to limit a working gas from the intake channel to be discharged from the exhaust channel through the intake region and the working region. a main body formed with a first space, a second space, a communicating hole communicating the first space to the second space, an intake channel, an exhaust channel, an opening of the first space and an opening of the second space being respectively located on each of two parallel sides of the main body; a pneumatic motor including a motor body provided within a working region of the first space,, and a transmission shaft connected to the motor body while extended from the second space through the communicating hole; and a grinding tool facing the second space and being joined to the transmission shaft, the grinding tool being turned by the transmission shaft, which is turned by impelling the motor body by the working gas; wherein the grinding package is characterized in that: the main body further comprises a connecting wall provided within the first space, the connection wall separates the first space into an intake region communicated to the intake channel and the working region communicated to the exhaust channel, wherein the connecting wall is not provided at the center of the first space, and the intake region is smaller than the working region, and wherein the connecting wall is provided with a ventilation hole communicating the intake region to the working region; and the grinding package further comprises a bridging part combined with the main body and the robotic arm, the bridging part closes off the first space to limit a working gas from the intake channel to be discharged from the exhaust channel through the intake region and the working region. the main body further comprises a connecting wall provided within the first space, the connection wall separates the first space into an intake region communicated to the intake channel and the working region communicated to the exhaust channel, wherein the connecting wall is not provided at the center of the first space, and the intake region is smaller than the working region, and wherein the connecting wall is provided with a ventilation hole communicating the intake region to the working region; and the grinding package further comprises a bridging part combined with the main body and the robotic arm, the bridging part closes off the first space to limit a working gas from the intake channel to be discharged from the exhaust channel through the intake region and the working region.