A device for pet animal droppings collection, including a hollow pole; a control lever, the control lever being placed inside the hollow pole and extending from one end of the hollow pole to the other end; an operating mechanism, the operating mechanism being installed on a fixing panel and fixed at one end of the hollow pole through the fixing panel, from which end the control lever extends from and is connected to the operating mechanism, and a spring being provided to cross-connect between the end of the control lever and the fixing panel, wherein the operating mechanism is composed of a movable assembly and a collection bag supporting assembly; and a droppings collection bag, the collection bag being disposed in a mountable and dismountable way on the operating mechanism.