Tensioning jack with tightening device

The utility model relates to a tensioning jack with a tightening device, which includes a jack, a support leg part and the tightening device, wherein the tightening device comprises a gear driving device and a gear driven device; the gear driven device comprises a driven gear, a gear rotary sleeve, a fixed sleeve, a synchronous rotary sleeve, a pin plate and a hexagonal sleeve; the top end of the fixed sleeve is connected with a locating base plate at the bottom of the jack; the gear rotary sleeve is connected with the fixed sleeve through an angular contact bearing II; the driven gear is connected with the gear rotary sleeve; the synchronous rotary sleeve is connected with the gear rotary sleeve through the pin plate; the hexagonal sleeve is mounted at the lower end of the synchronous sleeve; the gear driving device comprises a drive shaft and a driving gear mounted on the drive shaft, and the driving gear is engaged with the driven gear; the driving gear drives the synchronous rotary sleeve and the hexagona