An operation platform disposed on a substrate includes two guiding rail, two first driving devices, a carrying board and a second driving device. Each of the guiding rails includes a fixed bracket, a movable bracket and a plurality of rollers. The movable bracket received in the fixed bracket includes a pair of second sidewalls. Each second sidewall includes a plurality of bevels having a top portion and a bottom portion. The rollers positioned to the fixed bracket engage with the bevels to move perpendicularly to the substrate. The carrying board disposed on the guiding rails to support workpieces includes a plurality of supporting blocks. The first and second driving devices are used to drive the movable brackets and the carrying board respectively.