A liquid foam delivery device includes a pump proper, a linear transmission mechanism, a unidirectional input/output gas mechanism and a unidirectional input/output liquid mechanism. The pump proper has a rotating shaft. The linear transmission mechanism converts rotational motion output by the rotating shaft into linear reciprocating motion perpendicular to the rotating shaft. The unidirectional input/output gas mechanism admits gas into a gas inlet and discharge gas from a gas outlet in a direction perpendicular to the rotating shaft through the linear reciprocating motion of the linear transmission mechanism. The unidirectional input/output liquid mechanism delivers liquid admitted through a liquid inlet to a liquid outlet through the rotational motion output by the rotating shaft. The liquid foam delivery device delivers gas and liquid with only one pump proper and one rotating shaft to therefore minimize the required number of constituent components, achieve miniaturization, render assembly easy and cut cost.