The invention discloses a dry ice former, controlled via a PLC (programmable logic controller) and comprising a liquid CO2 storage tank, an oil tank connected with an oil pump, a liquid CO2 pipeline communicated with the liquid CO2 storage tank, a hydraulic cylinder and a dry ice forming assembly. An oil tank cooler is disposed inside the oil tank, a pipeline distributor is disposed on the liquid CO2 pipeline between the oil tank and the dry ice forming assembly. The dry ice forming assembly comprises a mold barrel fixedly connected with the hydraulic cylinder, a mold barrel piston, a mold head and a mold base, and a bore locking ring is mounted in a screw hole in the center of the mold barrel piston. The dry ice former is simple in structure and handy and reliable, the temperature of oil in the oil tank is effectively reduced, the service life of the former is prolonged, the problem of mold head damage due to screw failure is solved, normal production of the former is ensured, and the cost is reduced.