This kind of feeding platform is made of medium carbon steel plate and heavy caliber medium carbon steel tube. On the head position of the forming line, there is equipped multiple feed opening, which can meet the requirements of producing different specification of MgO board; Above the platform, there is installed three sets of blenders, which are used to stir different kind of raw materials sufficiently; there is also equipped automatic releasing agent device, which is used to guarantee the sufficient paining on the moldboard surface; It is adopted slipping silo to feed material and achieving save labour and time.