A method for adjusting an output power of a plurality of charging devices within a charging device group, wherein the method comprises the following steps: where an object to be charged is newly connected, determining whether a charging device group is in a full-load state, characterized in that if the charging device group is in the full-load state, determining a total output power deficit P def of the charging device group and a maximum reduction magnitude ∑ Δ P of a total output power of the charging device group; and based on P def and ∑ Δ P, selectively reducing (S120, S270) the output power of the charging devices within the charging device group in use, wherein the step of "determining a total output power deficit P def " specifically comprises subtracting the total rated maximum output power of the charging device group from the total output power of the charging device group after the newly connected object is connected to the charging device group; wherein the step of "determining a maximum reduction magnitude ∑ Δ P of a total output power of the charging device group" specifically comprises, for each of the charging devices in use: acquiring the rated maximum output power P n of the charging device in use; acquiring identification information of an object to be charged by the charging device in use; and based on the rated maximum output power P n and the identification information of the object to be charged, calculating the maximum reduction magnitude Δ P n of the output power of the charging device in use; and Σ Δ P = Δ P 1 + Δ P 2 + Δ P 3 + ⋯ ⋯ Δ P n; wherein Δ P 1, Δ P 2, Δ P 3 ··· Δ P n respectively correspond to the maximum reduction magnitude of an output power of each charging device in the charging device group. where an object to be charged is newly connected, determining whether a charging device group is in a full-load state, characterized in that if the charging device group is in the full-load state, determining a total output power deficit P def of the charging device group and a maximum reduction magnitude ∑ Δ P of a total output power of the charging device group; and based on P def and ∑ Δ P, selectively reducing (S120, S270) the output power of the charging devices within the charging device group in use, wherein the step of "determining a total output power deficit P def " specifically comprises subtracting the total rated maximum output power of the charging device group from the total output power of the charging device group after the newly connected object is connected to the charging device group; wherein the step of "determining a maximum reduction magnitude ∑ Δ P of a total output power of the charging device group" specifically comprises, for each of the charging devices in use: acquiring the rated maximum output power P n of the charging device in use; acquiring identification information of an object to be charged by the charging device in use; and based on the rated maximum output power P n and the identification information of the object to be charged, calculating the maximum reduction magnitude Δ P n of the output power of the charging device in use; and Σ Δ P = Δ P 1 + Δ P 2 + Δ P 3 + ⋯ ⋯ Δ P n; wherein Δ P 1, Δ P 2, Δ P 3 ··· Δ P n respectively correspond to the maximum reduction magnitude of an output power of each charging device in the charging device group. acquiring the rated maximum output power P n of the charging device in use; acquiring identification information of an object to be charged by the charging device in use; and based on the rated maximum output power P n and the identification information of the object to be charged, calculating the maximum reduction magnitude Δ P n of the output power of the charging device in use; and Σ Δ P = Δ P 1 + Δ P 2 + Δ P 3 + ⋯ ⋯ Δ P n; wherein Δ P 1, Δ P 2, Δ P 3 ··· Δ P n respectively correspond to the maximum reduction magnitude of an output power of each charging device in the charging device group.