A platform scanner is proposed to serve for a learning aid tool for kids of school age to learn words or painting. The platform scanner comprises a housing and a scanning carrier, in which an opaque handwriting board is disposed on an outside portion of the housing, and the scanning carrier is located on the handwriting board. Moreover, a transmission shaft is arranged in a direction parallel with the handwriting board, and one end of the scanning carrier is mounted on the transmission shaft so that the scanning carrier can be horizontally moved along the transmission shaft for scanning and reading data on the handwriting board.