Arm fixing equipment for blood drawing

The arm fixing equipment during blood drawing comprises a lifting part, the lifting part comprises a bottom shell, the bottom shell is fixedly connected to a table top, the top face of the bottom shell is open, the inner wall of the bottom shell is in sliding contact with a lifting shell, the bottom face of the lifting shell is open, and lifting pieces are arranged on the inner sides of an inner cavity of the lifting shell and an inner cavity of the bottom shell; the big arm fixing part comprises a fixing shell, the fixing shell is fixedly connected to one side of the top face of the lifting shell, opposite through holes are formed in the two opposite side faces of the fixing shell respectively, matched first fixing pieces are arranged at the top and the bottom of an inner cavity of the fixing shell respectively, and a disinfection piece is arranged on one side of the inner cavity of the fixing shell; a ventilation piece is arranged on the other side of the inner cavity of the fixed shell; the small arm fixin