The invention discloses a full-automatic biochemical analyzer with a multi-phase sample feeding system, and belongs to the field of medical biochemical detection equipment. The analyzer comprises an analyzer body, a sample disc is arranged on the analyzer body, and the analyzer is characterized in that an automatic sample storage mechanism is arranged in the analyzer body and comprises a mountingframe, a sample storage device and a sample taking device, and the sample taking device can transfer or place samples between the sample storage device and the sample disc. The full-automatic biochemical analyzer realizes automatic storage, transfer and extraction of samples, and thus, replaces manual sample placing, so that the efficiency is improved and the error rate is reduced. Besides, a sample liquid storage pipe in the device can store liquid to be measured in a closed manner, so that pollution and waste caused by leakage in the transfer process are avoided.