The invention discloses a pen-propping device with automatic alarm function and controllable pressure for epitaxial production, which comprises a pen-propping head, a pen body, a slide rod, a pen holder and a pressure-adjusting and automatic alarm device, wherein the pressure-adjusting and automatic alarm device comprises a shell, two spring seats, a button battery and a spring; the two spring seats, the button battery and the spring are arranged in the shell; the two spring seats are glidingly matched by axial holes, the spring is arranged between the two spring seats in a tensioned state, and metal sheets are respectively embedded on the inner walls of the axial holes and axial rods of the two spring seats; one end of the slide rod which is arranged in the pen holder is connected with the pen body for fixing the pen-propping head, and the other end of the slide rod contacts with one end of the first spring seat extending out of the shell. When the pen-propping head is pressed, the metal sheets of the two spring seats contact to switch on a circuit and brighten an alarm lamp. The pen-propping device can ensure that applied pen-propping pressure is consistent when an operator uplifts a liner bottom sheet arranged in a base, eliminates top sheet effect differences caused by human factors, and improves the resistivity consistency and the thickness uniformity of an epitaxial wafer.