The disclosure relates to a push-and-pull latch device including a housing, a latching component, a first elastic component, an inner-sleeve assembly, an inner-shaft component, a second elastic component and a third elastic component. The first elastic component abuts the latching component. The latching component engages an object through the housing. The inner-sleeve assembly is accommodated within the housing. The inner-shaft component is partially accommodated within the inner-sleeve assembly. The second elastic component is abutted between the inner-shaft component and the inner-sleeve assembly. The third elastic component includes a fixed portion connected to the inner-shaft component and an engaging end engaged with a guide groove of the inner-sleeve assembly. By driving the inner-shaft component to move the engaging end relative to the guide groove or move the inner-sleeve assembly relative to the housing, the relative positions between the components can be switched to provide the functions of opening and closing.