Device for measuring permeability coefficient of concrete

The invention discloses a device for measuring a permeability coefficient of concrete. The device comprises a water tank, a positioning water drum, a water outlet, a measuring drum, a telescopic water permeating support, a transparent cylinder with scales, a water overflowing opening, an upper water collection opening, a water pump and a water pipe, wherein the positioning water drum is positioned on the water tank; the water outlet is formed in the side face of the positioning water drum; the measuring drum is correspondingly arranged below the water outlet; the telescopic water permeating support is positioned in the positioning water drum and is used for holding a concrete test block; the transparent cylinder with scales sleeves the concrete test block; the water overflowing opening is formed in the side face of the transparent cylinder with scales; the upper water collection opening is formed in the part, corresponding to the water overflowing opening, on the water tank; the water tank is connected with t