The invention relates to a foundation checking calculation method and device, and belongs to the technical field of foundation design. The foundation checking calculation method comprises the following steps: acquiring load of a to-be-built object, foundation area information, and strength characteristics of a rock stratum, and determining the foundation pressure dispersion angle according to thestrength characteristics of the rock stratum; determining the stress value of the foundation of the to-be-built object on the underlying soil stratum according to the load of the to-be-built object, the foundation area information and the foundation pressure dispersion angle; and acquiring the settlement deformation, corresponding to the foundation, determined through calculation, judging whetherthe stress value and the settlement deformation meet the design requirement or not, and determining the checking calculation result according to the judgment result. According to the technical scheme,the simplified design of an independent foundation under the condition of no rules to follow is realized, the foundation checking calculation is realized under the condition of no rules to follow, foundation design is achieved by adopting a simple way, and the foundation design meets the requirements on safety and economy.