Position adjusting lifting appliance and lamp holder

The utility model discloses a position adjusting lifting appliance and lamp holder, position adjusting lifting appliance comprises a gear adjusting part and a connecting part, the gear adjusting part comprises an eccentric rotating part, a locking handle, a gear adjusting support and a fixing plate, the positions of first reamed holes on the two sides of the eccentric rotating part deviate from the center of the eccentric rotating part, and the connecting part is connected with the gear adjusting support. The locking handle is arranged in the eccentric rotating component, the gear adjusting support comprises a first extending plate, a hollow part is arranged on the first extending plate, the top edge of the hollow part comprises a movable position, a first locking position and a second locking position, and the locking handle can be clamped into the movable position, the first locking position or the second locking position. According to the utility model, the locking handle reaches the first locking position