A pessary for transvaginal haemostasis, consisting of: a balloon body made of an expandable material, wherein the balloon body is provided with a cavity having a filling hole, wherein the balloon body is provided with a first end and a second end, wherein the balloon body is provided with at least one hollow passage running through the first end and the second end of the balloon body and not intercommunicating with the cavity; and a support body configured to support a uterus, the support body having an engaging end and a support end, wherein the engaging end is engaged with the second end of the balloon body, wherein the support body is provided with a through-hole intercommunicating with the passage, wherein fluid is filled into or drawn out of the cavity through the filling hole to cause radial expansion or volume reduction of the balloon body, wherein a radial dimension of the balloon body after radial expansion is larger than a radial dimension of the support body, wherein the balloon body defines a first inner surface in the passage thereof, the support body defining a second inner surface in the through-hole thereof, the first inner surface of the passage and the second inner surface of the through-hole being connected to form an inner passage, by which the through-hole intercommunicates with the passage, wherein in a state that a fluid is accommodated in or flowing through the inner passage, the fluid is directly contacted with the first inner surface of the balloon body and/or the second inner surface of the support body characterized in that an outer surface of the balloon body is provided with at least one channel also running through the first end and the second end (lb) of the balloon body, and an outer surface of the support body is provided with at least one concave portion corresponding to the channel, and further characterized in that the balloon body as a whole forms an inflatable body that surrounds the cavity, the inflatable body being made of the expandable material. a balloon body made of an expandable material, wherein the balloon body is provided with a cavity having a filling hole, wherein the balloon body is provided with a first end and a second end, wherein the balloon body is provided with at least one hollow passage running through the first end and the second end of the balloon body and not intercommunicating with the cavity; and a support body configured to support a uterus, the support body having an engaging end and a support end, wherein the engaging end is engaged with the second end of the balloon body, wherein the support body is provided with a through-hole intercommunicating with the passage, wherein fluid is filled into or drawn out of the cavity through the filling hole to cause radial expansion or volume reduction of the balloon body, wherein a radial dimension of the balloon body after radial expansion is larger than a radial dimension of the support body, wherein the balloon body defines a first inner surface in the passage thereof, the support body defining a second inner surface in the through-hole thereof, the first inner surface of the passage and the second inner surface of the through-hole being connected to form an inner passage, by which the through-hole intercommunicates with the passage, wherein in a state that a fluid is accommodated in or flowing through the inner passage, the fluid is directly contacted with the first inner surface of the balloon body and/or the second inner surface of the support body characterized in that an outer surface of the balloon body is provided with at least one channel also running through the first end and the second end (lb) of the balloon body, and an outer surface of the support body is provided with at least one concave portion corresponding to the channel, and further characterized in that the balloon body as a whole forms an inflatable body that surrounds the cavity, the inflatable body being made of the expandable material.