A fluid management device and a thermal management system are provided. The fluid management device includes a fluid management module, a connecting member and a fluid management component, wherein the fluid management module is fixedly or limitedly connected to the connecting member; at least part of the fluid management component is located in a mounting hole; the fluid management device has a communicating channel, at least part of which is located in the connecting member; the communicating channel includes a first communicating channel being in communication with a first valve cavity of a first fluid management module, and a second communicating channel including a first sub-channel, a second sub-channel being in communication with a second valve cavity of a second fluid management module, and a third sub-channel. The opening degree of the second communicating channel can be adjusted by the fluid management component.
