The invention discloses automatic cutting and grinding equipment for slag ingots and dummy ingot plates, and belongs to the technical field of slag ingot and dummy ingot plate machining. The equipmentcomprises a platform, feeding devices, a conveying belt, a supporting device, two limiting devices, a grabbing device, a cutting device, a grinding device, a dust suction device and a discharging device, wherein the feeding devices, the conveying belt, the supporting device, the two limiting devices, the grabbing device, the cutting device, the grinding device, the dust suction device and the discharging device are all mounted on the platform. A feeding box is arranged at one end of the conveying belt, the number of the feeding devices is two, the two feeding devices are symmetrically arranged on the two sides of the feeding box, feeding blocks connected with the output ends of the two feeding devices correspondingly are further arranged in the feeding box, a connecting rod is arranged onthe conveying belt, and sliding grooves allowing the connecting rod to slide are formed in the two sides of the conveying belt. By means of the equipment, automatic feeding, clamping, limiting, supporting, cutting, grinding, dust collecting and discharging steps can be conducted on electroslag ingots and dummy ingot plates, the practicability is high, the automation degree is high, and the remarkable economic value is achieved.