The utility model relates to an unpowered tensioner. Its characteristics are: which comprises a bracket, install first cylinder (1) and the second drum (7) respectively on this support, on this firstcylinder (1) and on the second drum (7) respectively fixed mounting have first external gear and second external gear, this first external gear meshes with output shaft gear (9) of reduction gear (2),and output shaft gear (9) of this reduction gear (2) still with the outer gear engagement of second, the input shaft of this reduction gear (2) is connected with the power input transmission of hydraulic pump (3), and pipeline and overflow valve (4) are passed through in the import of this hydraulic pump (3), tension meter (5), stop valve (6) and hydraulic motor's export intercommunication. The utility model discloses an unpowered tensioner has reduced driving system, and the cost is reduced has avoided the atmosphere pollution, and the low noise has the feature of environmental protection, has improved electric power construction technique mechanized equipment technical strength and technical merit, has reduced the electric wire netting construction cost.