The invention discloses a wood board fixing platform of a carving machine. The thickness of a wood board is measured when the wood board is fixed through setting a ferromagnetic layer, a guide rail, alimiter, a splint, an electromagnet, a thickness measuring module and a silicon controlled rectifier, operation power of the electromagnet is automatically adjusted, suction between the electromagnet and the ferromagnetic layer is made to adapt to the thickness of the wood board, when the wood board is fixed, damage to the wood board is avoided, through setting a pressure sensor and an angle encoder, measurement data of the angle encoder is read when contact between the splint and the wood board is detected by the pressure sensor, the thickness of the wood board is then obtained, no manual measurement is required, and work efficiency is improved.