The invention relates to the field of construction site surveying and provides a construction site surveying method combining surface laser radar and oblique photography, comprising: S1, acquiring radar data; S2, acquiring oblique photography data; S3, introducing a laser point cloud model and a three-dimensional real scene model into a three-dimensional platform for processing, and allowing the processed information to be used in construction site design; S4, drawing a tomographic map and section of a construction site based on laser point cloud data to provide geographic data for working site design. A construction site surveying system combining surface laser radar and oblique photography is provided, comprising a surface laser scanner, a flight platform, a processing module and a camera mounted on the flight platform. The construction site surveying method and system combining surface laser radar and oblique photography have the advantages that the ground laser radar and oblique photography are combined, technical advantages are mutually complemented, manual measurement can be replaced, fine working site surveying can be achieved under high quality and high precision, field work is greatly decreased, surveying period is greatly shortened, and significant technical and social benefits are provided; rich information is acquired and is recorded via equipment, and data can be back-tracked at any time.