The utility model discloses a hourglass fluid recovery unit that portable laboratory discarded object relay system used relates to laboratory waste disposal equipment technical field, including the box two outside limits of box still are provided with lou fluid recovery unit respectively, hourglass fluid recovery unit include that the weeping collects house steward, the weeping more than two and collect branch pipe, weeping blow -down valve and weeping collection container, branch pipe 9 was collected to the weeping one end install respectively the lower part on box outside limit, and with body cavity bottom intercommunication, house steward's intercommunication is collected with the weeping to the other end, the both ends of weeping blow -down valve communicate the weeping respectively and collect house steward and weeping collection container, have that the exposed area of weeping on inner chamber bottom plate face is less, exposure time is shorter, the extent of injury of weeping characteristics such as less are used with present portable laboratory discarded object relay system is supporting, can be used to retrieve the weeping of all kinds of laboratories discarded object of temporary storage.