A pressure indicator consists of an upper cover (1), an intermediate member (2), an elastic pressure sensing diaphragm (3), a transmission indication rod (4), and a lower cover (5). A check valve (1-2) is disposed in the upper cover (1). An outer wall and the check valve (1-2) jointly constitutes an upper opening (1-1). The upper cover (1) and the intermediate member (2) jointly form an air channel (1-5) through the air. The lower port (2-2) of the intermediate member (2) is bonded to a circumferential flange (3-1) of the elastic pressure sensing diaphragm (3). A groove (3-6) fitted to a support end (4-1) of the transmission indication rod (4) is disposed in the lower surface (3-3) of the elastic pressure sensing diaphragm (3). The transmission indication rod (4) consists of the support end (4-1), a connection rod (4-2), an indication end (4-4), and holes (4-3). The connection rod (4-2) and the indication end (4-4) are separately connected to the top part and the bottom part of the support end (4-1). The holes (4-3) are located on two sides of the indication end (4-4).
