The invention provides 3D-printing concrete molding equipment capable of realizing aggregate piling and slurry flowing and a molding method. A printing head of the equipment comprises a printing hopper and a printing nozzle which are arranged in parallel, wherein the feeding port of the printing hopper communicates with an aggregate feeding system, and the feeding port of the printing nozzle communicates with a feeding system of fast-setting thixotropic cement slurry; the printing hopper and the printing nozzle are arranged front and back and move forwards in the same route; a scraping plate is arranged in the middle and used for scraping aggregate. During printing, aggregate is distributed first, then fast-setting thixotropic cement slurry is quickly dispersed along the printing path at aconstant speed, the cement slurry flows into gaps of the aggregate and quickly sets and hardens to form a whole concrete body, the steps are repeated and a product is formed after piling layer by layer. The equipment requires a simple molding process, is high in production efficiency and low in production cost and can be applied to printing of curved walls, artistic models and decorations, the defects of no large-particle aggregate, high consumption of concrete, high shrinkage and unavailability of addition of steel fibers in current mortar 3D printing techniques are overcome, and the moldingmethod is a special 3D-printing concrete molding process.