A method for determining a critical lifting depth of a building based on numerical simulation includes: establishing an initial building model based on a Midas-gts numerical modeling system; performing simulated lifting respectively on a plurality of lifting surfaces in the initial building model; obtaining a plurality of primary simulated settlement displacements of the initial building model after simulated lifting; taking a depth of a lifting surface corresponding to a primary simulated settlement displacement having a maximum difference from an initial settlement displacement as an initial critical lifting depth; performing secondary simulated lifting on lifting surfaces at positions above and below the initial critical lifting surface; and determining whether there exists a lifting surface having a larger difference; in response to the existence, taking a corresponding depth as a critical lifting depth; in response to the non-existence, taking the initial critical lifting depth as the critical lifting depth.