The invention discloses a carbon emission recursive analysis method for a non-standard structure variation process. The carbon emission recursive analysis method comprises the steps as follows: extracting carbon emission association change information of the non-standard structure variation process and creating an initial hierarchical structure variation and carbon emission association expression model; carrying out layer-by-layer subdivision and carbon emission association information mapping on a non-standard variation structure according to the hierarchical information of the structure; creating a hierarchical sub-structure variation and carbon emission association subdivision model based on the variation information of each hierarchical structure; carrying out layer-by-layer recursion and superposition to obtain carbon emission of initial non-standard structure variation. Aiming at the problem of difficulty for analyzing carbon emission of a non-standard structure of a complex mechanical product, the non-standard structure is hierarchically subdivided, a hierarchical structure variation and carbon emission association relationship is created by a structure and carbon emission association base model, the carbon emission is quantized through carbon emission factors, and the carbon emission in the non-standard structure variation process is analyzed by recursively computing the carbon emission upwards layer by layer from the most subdivided structure, therefore a quantitative basis for a low-carbon variation scheme is provided.