The invention discloses an unmanned aerial vehicle power system testing platform. The unmanned aerial vehicle power system testing platform comprises a base, a single-propeller motor bracket and a double-propeller motor bracket; a power detection device is arranged on the base; the single-propeller motor bracket is rotationally connected to the base and used for mounting a first motor assembly; the double-propeller motor bracket is detachably connected with the single-propeller motor bracket and used for mounting a second motor assembly; the position of the double-propeller motor bracket is adjustable relative to the position of the single-propeller motor bracket; and the power detection device detects working power parameters of the first motor assembly or detects power parameters of thefirst motor assembly and the second motor assembly during simultaneous working. According to the unmanned aerial vehicle power system testing platform, by using the single-propeller motor bracket rotationally connected to the base and the double-propeller motor bracket detachably connected to the single-propeller motor bracket, the parameters of the power system in which only the single propellerworks can be measured, and the parameters of the power system in which the double propellers mutually work can also be measured; and therefore, the applicability is wide, and the testing cost of an unmanned aerial vehicle power system is reduced.