A method for manufacturing an aluminum-coated blank, comprising: aligning two or more aluminum-coated steel sheets such that an edge of one of the aluminum-coated steel sheets faces an edge of the other aluminum-coated steel sheet; and providing a filler wire to the facing portions of the aluminum-coated steel sheets, and melting the facing portions of the aluminum-coated steel sheets and the filler wire by laser beam irradiation from a laser head to form a joint, wherein the steel sheets are joined together by irradiating a laser beam so as to form a pattern at a predetermined angle with respect to a direction in which the joint is formed, the laser beam has a frequency of 100 to 1,500 Hz and a power of 1 to 20 kW with a radius of the laser beam ranging from 0.1 mm to 1 mm, and each of the aluminum-coated steel sheets comprises: a base steel sheet comprising an amount of 0.01 to 0.5 wt% of carbon, an amount of 0.01 to 1.0 wt% of silicon (Si), an amount of 0.5 to 3.0 wt% of manganese (Mn), an amount of greater than 0 but not greater than 0.05 wt% of phosphorus, an amount of greater than 0 but not greater than 0.01 wt% of sulfur, an amount of greater than 0 but not greater than 0.1 wt% of aluminum (Al), an amount of greater than 0 but not greater than 0.001 wt% of nitrogen, and the balance of iron (Fe) and other inevitable impurities; and a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m 2, characterized in that the joint is formed at a speed of 15 to 120 mm/sec, the frequency of the laser beam, the radius of the laser beam and the speed at which the joint is formed satisfy a relationship represented by the following Equation 1: f × r v ∝ ≥ 1 wherein α is 0.7, f is the frequency (Hz) of the laser beam, r is the radius (mm) of the laser beam, measured on the surface of each of the aluminum-coated steel sheets, and v is the speed (mm/sec) at which the joint is formed, and the predetermined angle of the pattern of the laser beam ranges from 45° to less than 90°. aligning two or more aluminum-coated steel sheets such that an edge of one of the aluminum-coated steel sheets faces an edge of the other aluminum-coated steel sheet; and providing a filler wire to the facing portions of the aluminum-coated steel sheets, and melting the facing portions of the aluminum-coated steel sheets and the filler wire by laser beam irradiation from a laser head to form a joint, wherein the steel sheets are joined together by irradiating a laser beam so as to form a pattern at a predetermined angle with respect to a direction in which the joint is formed, the laser beam has a frequency of 100 to 1,500 Hz and a power of 1 to 20 kW with a radius of the laser beam ranging from 0.1 mm to 1 mm, and each of the aluminum-coated steel sheets comprises: a base steel sheet comprising an amount of 0.01 to 0.5 wt% of carbon, an amount of 0.01 to 1.0 wt% of silicon (Si), an amount of 0.5 to 3.0 wt% of manganese (Mn), an amount of greater than 0 but not greater than 0.05 wt% of phosphorus, an amount of greater than 0 but not greater than 0.01 wt% of sulfur, an amount of greater than 0 but not greater than 0.1 wt% of aluminum (Al), an amount of greater than 0 but not greater than 0.001 wt% of nitrogen, and the balance of iron (Fe) and other inevitable impurities; and a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m 2, a base steel sheet comprising an amount of 0.01 to 0.5 wt% of carbon, an amount of 0.01 to 1.0 wt% of silicon (Si), an amount of 0.5 to 3.0 wt% of manganese (Mn), an amount of greater than 0 but not greater than 0.05 wt% of phosphorus, an amount of greater than 0 but not greater than 0.01 wt% of sulfur, an amount of greater than 0 but not greater than 0.1 wt% of aluminum (Al), an amount of greater than 0 but not greater than 0.001 wt% of nitrogen, and the balance of iron (Fe) and other inevitable impurities; and a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m 2, the joint is formed at a speed of 15 to 120 mm/sec, the frequency of the laser beam, the radius of the laser beam and the speed at which the joint is formed satisfy a relationship represented by the following Equation 1: f × r v ∝ ≥ 1 wherein α is 0.7, f is the frequency (Hz) of the laser beam, r is the radius (mm) of the laser beam, measured on the surface of each of the aluminum-coated steel sheets, and v is the speed (mm/sec) at which the joint is formed, and the predetermined angle of the pattern of the laser beam ranges from 45° to less than 90°.