A high speed filtration device using porous filtration media comprising: a housing; an inlet pipe configured to supply the inflow water to be filtered into the housing; a filtration media bed arranged upward apart from the bottom surface of the housing; an outflow pipe arranged below the filtration media bed to discharge the water filtered through the filtration media bed out of the housing; a backwash equipment arranged between the bottom of the housing and the filtration media bed to supply the backwash water upflow; and a discharge pipe configured to discharge the backwash water and pollutants above the upper portion of the filtration media bed, characterized in that the filtration media bed is provided with a porous filtration media, the inflow water is designed to be filtered by downflow through the filtration media bed, the porous filtration media consists of particles formed by mixing glass powder with vesicant, heating at a high temperature and pulverizing after cooling, thereby having particles of less than 3mm in diameter, bulk density of 0.4∼1.2g/cm 3 in dry bulk volume and bulk density of 1.3∼1.8g/cm 3 in water saturated bulk volume such that the porous filtration media can be entrained and can rise along with pollutants by the supply of backwash water, and after the porous filtration media settled down, the backwash water and the pollutants can be discharged through the discharge pipe the discharge pipe is positioned at a lower portion than a middle point between the upper portion of the housing and the filtration media bed such that during backwashing process, the level of the backwash water could be set to be higher than the discharge pipe and lower than the upper portion of the housing so as not to overflow the housing, and that the filtration media bed includes a support unit arranged across the high speed filtration device, more than one wire mesh or perforated plate, a coarse sand layer that does not pass through the wire mesh, and a porous filtration media on the sand layer. a housing; an inlet pipe configured to supply the inflow water to be filtered into the housing; a filtration media bed arranged upward apart from the bottom surface of the housing; an outflow pipe arranged below the filtration media bed to discharge the water filtered through the filtration media bed out of the housing; a backwash equipment arranged between the bottom of the housing and the filtration media bed to supply the backwash water upflow; and a discharge pipe configured to discharge the backwash water and pollutants above the upper portion of the filtration media bed, characterized in that the filtration media bed is provided with a porous filtration media, the inflow water is designed to be filtered by downflow through the filtration media bed, the porous filtration media consists of particles formed by mixing glass powder with vesicant, heating at a high temperature and pulverizing after cooling, thereby having particles of less than 3mm in diameter, bulk density of 0.4∼1.2g/cm 3 in dry bulk volume and bulk density of 1.3∼1.8g/cm 3 in water saturated bulk volume such that the porous filtration media can be entrained and can rise along with pollutants by the supply of backwash water, and after the porous filtration media settled down, the backwash water and the pollutants can be discharged through the discharge pipe the discharge pipe is positioned at a lower portion than a middle point between the upper portion of the housing and the filtration media bed such that during backwashing process, the level of the backwash water could be set to be higher than the discharge pipe and lower than the upper portion of the housing so as not to overflow the housing, and that the filtration media bed includes a support unit arranged across the high speed filtration device, more than one wire mesh or perforated plate, a coarse sand layer that does not pass through the wire mesh, and a porous filtration media on the sand layer.