Disclosed is a blasting apparatus comprising: an injection part which treats the surface of a material to be processed by injecting an abrasive to the material to be processed; a first tank which is connected to the injection part and stores the abrasive therein; a supplying part which supplies compressed air for the injection of the abrasive; a suction part which sucks the external abrasive and foreign materials generated on the surface of the material to be processed due to the injection of the abrasive according to the supply of the compressed air and mixes the foreign materials with the abrasive to discharge the first mixed gas to the outside; a second tank which collects the abrasive from the first mixed gas to form second mixed gas; and a power generation part which generates electricity according to the supply of the second mixed gas.
