The invention discloses an elevator adjusting device for adjusting the lift car weight automatically. The elevator adjusting device comprises a lift car and an elevator door, wherein the bottom of thelift car is provided with a fixed floor, a first liquid box with a piston is fixedly arranged below the fixed floor, the piston is fixedly connected with the lift car through at least two force storing springs, a supporting floor is arranged above the fixed floor, a supporting conduction mechanism penetrating through the fixed floor is arranged between the supporting floor and the piston, the first liquid box is internally provided with a stretching and contracting guide pipe, the stretching and contracting guide pipe is fixed with the elevator door through a connection rod, an elevator wellis provided with one second liquid box at each elevator stopping storey position, and the second liquid boxes are provided with liquid guide pipes butted to the stretching and contracting guide pipe.By means of the elevator adjusting device for adjusting the lift car weight automatically, the problem of unbalanced mass between the lift car end and the counterweight end under different loads of anelevator can be solved.