The invention discloses a hinged-type dumper power transmission system. The hinged-type dumper power transmission system comprises a power assembly arranged at the front end of a dumper frame assemblyand a transmission system body connected with the dumper frame assembly, and the power assembly comprises an air filter, an engine air inlet pipe, a turbo-supercharger, an intercooler air inlet pipe,an intercooler, an intercooler air outlet pipe, a butterfly valve, an engine air discharging pipe, a silencer, a heat dissipater water inlet pipe, a heat dissipater assembly, a heat dissipater wateroutlet pipe, an engine body and a fuel oil tank. The transmission system body comprises a gearbox, a front axle assembly, a transfer case, a hinging body, a middle axle assembly, a rear axle assembly,a gearbox-transfer case transmission shaft, a transfer case-front axle transmission shaft, a transfer case-hinging body transmission shaft, a hinging body-middle axle transmission shaft, a middle axle-rear axle transmission shaft, an oil heat dissipater water inlet pipe, an oil heat dissipater oil inlet pipe, an oil heat dissipater, an oil heat dissipater water outlet pipe and an oil heat dissipater oil outlet pipe. The hinged-type dumper power transmission system provided by the invention is simple in structure, high in reliability, convenient to repair and maintain, rapid in repairing and maintaining, and high in power transmission efficiency.