The invention discloses an oil pressure alarm for an automobile. The oil pressure alarm comprises a cable connector, an installation block, a locating block, a binding post, a static contact piece, a movable contact piece, a transmission spring, an insulating block, an inductive head, a ceramic sensitive element and a connecting wire. The oil pressure alarm is characterized in that the cable connector is provided with connection contacts, and the installation block is provided with a fixture block; the locating block is arranged on the installation block, and one end of the binding post is connected to a stable block; the other end of the binding post is arranged in an inner cavity; the transmission spring is arranged between the static contact piece and the movable contact piece, and the insulating block is arranged on the installation block; and the inductive head is wrapped by the ceramic sensitive element. According to the oil pressure alarm disclosed by the invention, the inner cavity of the installation block is internally provided with the static contact piece and the movable contact piece, and the transmission spring is arranged between the static contact piece and the movable contact piece; the movable contact piece is connected to the inductive head, and the static contact piece is connected to the binding post; the position of the inductive head is adjusted through the transmission spring and the movable contact piece under different oil pressure conditions, and the reliability of the pressure alarm is improved.