The invention discloses a water-coupled charging blasting demolition method for a reinforced concrete beam or column. The process that blast holes are formed along the axis of the reinforced concrete beam or column and water is poured into the blast holes is adopted, and the aims of reducing resistance of deep hole charging, achieving accurate charging, efficiently utilizing water pressure blasting energy, effectively controlling the strength and amount of vibration of blasting, blasting flyrock, air shock waves and poisonous blasting gas and reducing blasting dust are achieved. According to the method, the process is simple, operation is easy, the application range is wide, and the method is an ideal construction method for demolition of the reinforced concrete beam and column.