Isolation valve sealing test device

The invention relates to an isolation valve sealing performance test device, which comprises a container, an inner cavity used for accommodating liquid is arranged in the container, the inner cavity is defined into a liquid storage area and a gas storage area by the liquid accommodated in the inner cavity, and the container is provided with a first interface communicated with the liquid storage area and a second interface communicated with the gas storage area; an outlet of the liquid inlet pipeline is communicated with the first connector of the container; an inlet of the first air inlet pipeline is communicated with the second interface of the container, and an outlet of the first air inlet pipeline is used for being communicated with an inlet of a tested pipeline system; the pressurizing device is configured to have a first state for providing preset pressure for the liquid inlet pipeline; when the pressurizing device is in a first state, liquid in the liquid inlet pipeline responds to preset pressure and