The invention relates to a container emptying device (1) for emptying at least one container (6) filled with a liquid, comprising a suction unit (2), a receiving unit (4) and a pipe unit (3) connecting the receiving unit (4) with the suction unit (2). The suction unit (2) comprises at least one suction lance (2a) adapted to be inserted and lowered into the container (6), at least one pump (2c), connecting the suction lance (2a) with the pipe unit (3), for pumping the liquid out of the container (6) and a control device for controlling a suction process. The pipe unit (3) comprises at least one flexible pipe for transporting the liquid out of the container (6).