The invention discloses a foil unwinding delayed automatic control system for corrosion foil production. The foil unwinding delayed automatic control system for corrosion foil production comprises a PLC control module, a tension control module, a delayed control module and a delayed transmission module; the PLC control module is composed of a master switch, an emergency stop switch, a limiting switch, a PLC digital input module, a programmable logic controller and a PLC output module; the tension control module is composed of a tension sensor, a tension controller and a frequency converter; the delayed control module is composed of fixing channel steel, limiting switches, a protecting air cylinder, an electromagnetic chuck, a fixing bracket, a protective cover, a coupling shaft device anda speed reducer; and the delayed transmission module is composed of a metal rotation shaft, a delayed rope winder, a bearing pedestal, a delayed pulling rope, a delayed transmission roll set, a counterweight rope winder, a counterweight pulling rope and a lifting lump. The foil unwinding delayed automatic control system for corrosion foil production has the following advantages that manual foil unwinding delayed control is replaced with the PLC control system, and the working efficiency is improved; and the foil unwinding tension is precisely controlled through the tension control module, andtherefore production loss is reduced.