The invention aims to provide a wing interior supporting structure of an unmanned aerial vehicle. The wing interior supporting structure of the unmanned aerial vehicle comprises a front transverse beam, a rear transverse beam, a connecting baffle and a plurality of supporting plates. The front transverse beam comprises a front transverse beam outer rod and a front transverse beam inner rod, and the rear transverse beam comprises a rear transverse beam outer rod and a rear transverse beam inner rod. The front transverse beam inner rod comprises a front transverse beam inner rod metal rod and a front transverse beam inner rod composite rod. The rear transverse beam inner rod comprises a rear transverse beam inner rod metal rod and a rear transverse beam inner rod composite rod. The front transverse beam and the rear transverse beam are arranged in parallel. Any one supporting plate is perpendicular to the front transverse beam and is movably connected with the front transverse beam. Any one supporting plate is movably connected with the rear transverse beam. The connecting baffle is provided with a front connecting through hole and a rear connecting through hole. The wing interior supporting structure of the unmanned aerial vehicle has the beneficial effects that by means of the two transverse beam structures each of which is made of metal and a composite material in combination, vibration of a wing interior structure in the flying process of the unmanned aerial vehicle is reduced and the flying stability and flying speed are guaranteed on the premise that the strength is guaranteed and the whole wing weight is not markedly increased.