The invention relates to an automatic iron-discharging type coupling wheel crusher. The automatic iron-discharging type coupling wheel crusher comprises a coupling wheel crusher body, a material cutting mechanism is arranged on the coupling wheel crusher body, and a discharging mechanism is arranged below the coupling wheel crusher body; the discharging mechanism comprises an emergency discharging device and a normal discharging device; the normal discharging device is internally provided with a semi-magnetic roller device used for dividing the normal discharging device into a normal discharging space and an irony impurity storage space; irony impurities attracted by the semi-magnetic roller device are discharged into the irony impurity storage space, and leftovers are discharged into the normal discharging space; the emergency discharging device is used for emergency evacuation of the coupling wheel crusher body. The automatic iron-discharging type coupling wheel crusher can effectively discharge the irony impurities to ensure the safety of follow-up smashing devices and precisely control the size ranges of particles to guarantee follow-up efficient proceeding of a breaking process, and therefore the distribution of particle size is even after smashing, the yield and quality of products are improved, and the surrounding environment is protected.