The invention discloses a method for identifying the weight of single vehicles in a vehicle feet based on bridge dynamic strain and belongs to the bridge test detection, health monitoring and overloading vehicle governance field. A high-resolution strain test device (sensor) is arranged in the span or maximum strain reaction cross section of a beam bridge; the dynamic strain time travel curve of the bridge under the effect of the vehicle feet is tested; filtering and de-noising or fitting is performed on the dynamic strain time travel curve; first-order derivation and second-order derivation are performed on the curve; and the weight of the single vehicles in the vehicle feet is calculated based on finite element simulation results and curve derivation results. According to the method, only one strain reaction test cross section is required to be set on the beam bridge, and therefore, installation is simple, and cost is low; a bridge deck or pavement structure is not required to be damaged, and existing bridges and roads will not be damaged; and the recognition algorithm is simple and accurate.