To obtain a curing mat for antifreezing for a ground surface which is excellent in thermal insulatability and waterproofness and is excellent in usability and removing workability by covering the entire surface of a synthetic resin soft foam plate specified in apparent density, modulus of elasticity in bending and thickness with a waterproof covering sheet.

The curing mat for antifreezing is constituted by covering the entire surface of the synthetic resin soft foam plate 1 with the waterproof covering sheet 2. The synthetic resin soft foam plate 1 is preferably a foam sheet of, for example, a polystyrene system and its apparent density is set at 0.007 to 0.035 g/cm3, by which the plate is made easily liftable and the deflect at the time of lifting is lessened. The modulus of elasticity in bending is set at 2 to 25 kg/cm2, by which the plate is made easily fittable to the ruggedness of the ground surface and the effect of antifreezing and curing is improved. Further, the thickness is set at 10 to 100 mm to assure the thermal insulatability and bending strength necessary for antifreezing. As a result, the thermal insulatability is improved and the freezing is surely prevented. In addition, the workability when in use and removing is improved.