An automatically loaded ejection-type blood sampling device is used in the field of medical instruments. In the automatically loaded ejection-type blood sampling device, a blood sampling needle casing (1) with a blood sampling needle (8) provided therein is mounted on the top of a lancing device casing (1A). A hitting hammer (2A) is triggered by a restoring force of a compressed hammer striking spring (21A). During the mounting process of the blood sampling needle part, the blood sampling needle part only needs to slide along a guide rail and is thus mounted by one step. Therefore, automatic loading by means of triggering and automatic loading by means of ejection of the lancing device are realized, and one-button triggering and one-button ejection are realized when the blood sampling device is used. The blood sampling device is portable, and a user does not need to touch the blood sampling needle (8) when being removed, so the blood sampling device is safe and convenient to use. The safety-type blood sampling device has a simple structure and low fabrication cost, can be operated by one hand and/or used together with a matching lancing device according to different structures, and can effectively ensure the safety of blood sampling operation.