The invention discloses an air-permeable safety helmet for building construction. The helmet comprises a helmet body, a partition layer and air-permeable holes. Spring columns are arranged on the topof the helmet body, a buffer plate is connected to the upper ends of the spring columns, and a clamping groove is fixed to the middle of the left side of the helmet body; a rotation column is installed at the bottom of the left side of the helmet body, a baffle is connected to the tail end of the rotation column, and the partition layer is arranged in the helmet body; a rain cape is installed in the partition layer, connection strips are arranged on the periphery of the inner wall of the partition layer, and helmet linings are connected to the tail ends of the connection strips; the air-permeable holes are fixed in the front, rear and right sides in the helmet body, and helmet brims are connected to the front, rear and right sides of the lower portion of the bottom of the helmet body. According to the air-permeable safety helmet for building construction, through the spring columns arranged on the helmet body, the buffer plate is connected with the helmet body through the spring columns, the impact force formed in the process when a falling object falls can be weakened through the cooperation between the buffer plate and springs, and accordingly the safety degree of workers is improved.