A blood collection device, comprising: a shell, wherein an accommodating cavity is formed in the shell, and the shell has a first opening and a second opening; a blade seat, pivotally arranged in the accommodating cavity, wherein a blade is arranged to the blade seat, and the blade is suitable for being exposed from the shell through the first opening when the blade seat pivots; an elastic component, arranged in the accommodating cavity, wherein one end of which is connected to the shell, and the other end of which is connected to the blade seat to provide an elastic force for pivoting the blade seat; a triggering portion, wherein the triggering portion comprises an operating end and an abutting end that are respectively arranged at two ends thereof, the triggering portion is suitable for pivoting around a pivot shaft arranged in the shell, the operating end extends from the second opening to the outside of the shell, the abutting end is located in the accommodating cavity, based on the operation of the operating end, the triggering portion is suitable for pivoting from a first position to a second position, at the first position, the abutting end is suitable for abutting against the blade seat to prevent the blade seat from pivoting, and at the second position, the abutting end deviates from the blade seat to allow the blade seat to pivot based on the elastic force of the elastic component, characterized in that: a first cooperation column is arranged in the shell and is located at the upper side of the triggering portion spaced from the triggering portion; and an elastic arm is connected to the upper side of the triggering portion, the end part of the elastic arm is located in the accommodating cavity and comprises a blocking portion, the end part of the elastic arm is suitable for being located at one side of the first cooperation column when the triggering portion is at the first position, and is located at the other side of the first cooperation column when the triggering portion pivots from the first position to the second position, and the blocking portion provides resistance for the end part of the elastic arm while moving from one side of the first cooperation column to the other side. a shell, wherein an accommodating cavity is formed in the shell, and the shell has a first opening and a second opening; a blade seat, pivotally arranged in the accommodating cavity, wherein a blade is arranged to the blade seat, and the blade is suitable for being exposed from the shell through the first opening when the blade seat pivots; an elastic component, arranged in the accommodating cavity, wherein one end of which is connected to the shell, and the other end of which is connected to the blade seat to provide an elastic force for pivoting the blade seat; a triggering portion, wherein the triggering portion comprises an operating end and an abutting end that are respectively arranged at two ends thereof, the triggering portion is suitable for pivoting around a pivot shaft arranged in the shell, the operating end extends from the second opening to the outside of the shell, the abutting end is located in the accommodating cavity, based on the operation of the operating end, the triggering portion is suitable for pivoting from a first position to a second position, at the first position, the abutting end is suitable for abutting against the blade seat to prevent the blade seat from pivoting, and at the second position, the abutting end deviates from the blade seat to allow the blade seat to pivot based on the elastic force of the elastic component, characterized in that: a first cooperation column is arranged in the shell and is located at the upper side of the triggering portion spaced from the triggering portion; and an elastic arm is connected to the upper side of the triggering portion, the end part of the elastic arm is located in the accommodating cavity and comprises a blocking portion, the end part of the elastic arm is suitable for being located at one side of the first cooperation column when the triggering portion is at the first position, and is located at the other side of the first cooperation column when the triggering portion pivots from the first position to the second position, and the blocking portion provides resistance for the end part of the elastic arm while moving from one side of the first cooperation column to the other side. a first cooperation column is arranged in the shell and is located at the upper side of the triggering portion spaced from the triggering portion; and an elastic arm is connected to the upper side of the triggering portion, the end part of the elastic arm is located in the accommodating cavity and comprises a blocking portion, the end part of the elastic arm is suitable for being located at one side of the first cooperation column when the triggering portion is at the first position, and is located at the other side of the first cooperation column when the triggering portion pivots from the first position to the second position, and the blocking portion provides resistance for the end part of the elastic arm while moving from one side of the first cooperation column to the other side.