The invention discloses a pile top and pile tip settlement simultaneous observation device and method for a pile foundation mold test. The pile top and pile tip settlement simultaneous observation device comprises a base, a simulating pile, a connecting rod and two displacement sensors, wherein the bottom part of the simulating pile is rigidly connected to one base; the top part of the simulatingpile is sleeved with a hollow loading plate; the simulating pile is connected with a sleeve; a solid loading plate is arranged at the top part of the sleeve; a hollow groove is formed in a side wall of the sleeve; one of the two displacement sensors is used for measuring the displacement of the hollow loading plate and the other displacement sensor is used for measuring the displacement of a movable plate; the movable plate is horizontally arranged; one end of the movable plate penetrates through the hollow groove in the sleeve to be suspended and the other end of the movable plate is locatedin the sleeve and is rigidly connected with the vertically-arranged connecting rod; the bottom part of the connecting rod is connected with the base; pile top settlement is equalized to vertical displacement of the loading plates through one sensor; pile tip settlement is equivalently converted to the base and the pile tip settlement is equal to the vertical displacement of the movable plate.