A balance valve, comprising: a body, the body being provided with a ventilation channel; a breathable membrane, the breathable membrane being arranged at one end of the ventilation channel, and the breathable membrane being configured to maintain a gas circulation of the ventilation channel; and a gas barrier structure, the gas barrier structure being arranged at an other end of the ventilation channel, and the gas barrier structure being configured to close the ventilation channel when gas pressures inside and outside the gas barrier structure are balanced, while the gas barrier structure being configured to open the ventilation channel when the gas pressures inside and outside the gas barrier structure are unbalanced, so as to achieve a balance of the gas pressure inside and outside the gas barrier structure; wherein the gas barrier structure comprises a first barrier member and a second barrier member; when the gas pressure inside the gas barrier structure is greater than the gas pressure outside, the first barrier member is configured to be able to open unidirectionally towards the outside; when the gas pressure outside the gas barrier structure is greater than the gas pressure inside, the second barrier member is configured to be able to open unidirectionally towards the inside; when the gas pressure outside the gas barrier structure is balanced with the gas pressure inside, the first barrier member and the second barrier member are configured to close the ventilation channel together; wherein the gas barrier structure further comprises a base, and the base is provided with a first through hole and a second through hole, the first through hole and the second through hole are both in communication with the ventilation channel; when the gas pressure inside the gas barrier structure is greater than the gas pressure outside, the first barrier member is configured to open the first through hole; when the gas pressure outside the gas barrier structure is greater than the gas pressure inside, the second barrier member is configured to open the second through hole; when the gas pressure outside the gas barrier structure is balanced with the gas pressure inside, the first barrier member closes the first through hole and the second barrier member closes the second through hole; characterized in that: the first barrier member is arranged in the first through hole, and the second barrier member is arranged in the second through hole. a body, the body being provided with a ventilation channel; a breathable membrane, the breathable membrane being arranged at one end of the ventilation channel, and the breathable membrane being configured to maintain a gas circulation of the ventilation channel; and a gas barrier structure, the gas barrier structure being arranged at an other end of the ventilation channel, and the gas barrier structure being configured to close the ventilation channel when gas pressures inside and outside the gas barrier structure are balanced, while the gas barrier structure being configured to open the ventilation channel when the gas pressures inside and outside the gas barrier structure are unbalanced, so as to achieve a balance of the gas pressure inside and outside the gas barrier structure; wherein the gas barrier structure comprises a first barrier member and a second barrier member; when the gas pressure inside the gas barrier structure is greater than the gas pressure outside, the first barrier member is configured to be able to open unidirectionally towards the outside; when the gas pressure outside the gas barrier structure is greater than the gas pressure inside, the second barrier member is configured to be able to open unidirectionally towards the inside; when the gas pressure outside the gas barrier structure is balanced with the gas pressure inside, the first barrier member and the second barrier member are configured to close the ventilation channel together; wherein the gas barrier structure further comprises a base, and the base is provided with a first through hole and a second through hole, the first through hole and the second through hole are both in communication with the ventilation channel; when the gas pressure inside the gas barrier structure is greater than the gas pressure outside, the first barrier member is configured to open the first through hole; when the gas pressure outside the gas barrier structure is greater than the gas pressure inside, the second barrier member is configured to open the second through hole; when the gas pressure outside the gas barrier structure is balanced with the gas pressure inside, the first barrier member closes the first through hole and the second barrier member closes the second through hole; characterized in that: the first barrier member is arranged in the first through hole, and the second barrier member is arranged in the second through hole.