Variable descaling control method between hot continuous rolling finishing mill group racks

The invention discloses a variable descaling control method between racks of a hot continuous rolling finishing mill group, which comprises the following steps of: a, in a process machine control system, setting water used between corresponding racks as a function code used by descaling water and cooling water according to steel types and specification information of different products; b, the basic automation control system receives and identifies the function code issued by the process control system; c, starting and controlling the corresponding inter-frame water used by the descaling water according to the identification and the descaling water control time sequence; meanwhile, the water used between the corresponding racks and set to be used by cooling water is subjected to opening and closing time sequence control according to the cooling water function. According to different steel types and specifications, the quantity of available descaling water and the quantity of available cooling water can be fle