The invention provides a connection-pipe sediment prevention device and method. In said connection-pipe sediment prevention device, at least a pressuring element is disposed at an opening of a pipe body of said connection-pipe, and a controller controls reciprocal movements of said pressuring elements, to make suspension liquid to flow in said connection-pipe and not to produce sediment. A nozzle is provided at bottom of said connection-pipe, to spray out said suspension liquid. Said connection-pipe sediment prevention method utilizes same means to make powder distribute evenly in said suspension liquid, so that said suspension liquid is sprayed out evenly from said nozzle. A connection-pipe principle is used, such that said suspension liquid having insoluble powder will not produce sediment, in achieving uniform spray. In addition, it is not required to put in large amount of powder and liquid at one time, thus saving production cost.