A pressure sensor, comprising: a housing defining a communication passageway; a sensing element disposed in the housing, the sensing element being in fluid communication with an outside of the housing through the communication passageway; and characterised in that the pressure sensor is further provided with a compensating structure, so that when a contact force is increased due to occurrence of a volume expansion of a liquid passed into the housing through the communication passageway, the compensating structure compensates for the volume expansion, wherein the compensating structure comprises a first compensating structure, a second compensating structure and a third compensation structure, the first compensation structure being configured to increase a volume of the communication passageway and the housing forms a pressure tube surrounding a portion of the communication passageway and the first compensating structure includes a plug fitted in the pressure tube of the housing, wherein the plug has a through-hole in the plug or a through-channel on a perimeter of the plug which constitutes a portion of the communication passageway, the second compensating structure being configured to control the freezing sequence of the liquid passed into the pressure sensor so that the liquid adjacent to the sensing element is frozen prior to the liquid away from the sensing element; and wherein the third compensating structure configured to be elastically deformed to maintain a liquid volume within the pressure sensor, the third compensating structure comprising a mounting member, which is disposed on an outer side surface of the housing, the mounting member being configured to elastically deform to maintain the liquid volume within the pressure sensor when a force is applied to the pressure sensor due to the liquid volume expansion. a housing defining a communication passageway; a sensing element disposed in the housing, the sensing element being in fluid communication with an outside of the housing through the communication passageway; and characterised in that the pressure sensor is further provided with a compensating structure, so that when a contact force is increased due to occurrence of a volume expansion of a liquid passed into the housing through the communication passageway, the compensating structure compensates for the volume expansion, wherein the compensating structure comprises a first compensating structure, a second compensating structure and a third compensation structure, the first compensation structure being configured to increase a volume of the communication passageway and the housing forms a pressure tube surrounding a portion of the communication passageway and the first compensating structure includes a plug fitted in the pressure tube of the housing, wherein the plug has a through-hole in the plug or a through-channel on a perimeter of the plug which constitutes a portion of the communication passageway, the second compensating structure being configured to control the freezing sequence of the liquid passed into the pressure sensor so that the liquid adjacent to the sensing element is frozen prior to the liquid away from the sensing element; and wherein the third compensating structure configured to be elastically deformed to maintain a liquid volume within the pressure sensor, the third compensating structure comprising a mounting member, which is disposed on an outer side surface of the housing, the mounting member being configured to elastically deform to maintain the liquid volume within the pressure sensor when a force is applied to the pressure sensor due to the liquid volume expansion.