The invention discloses a wave making machine of a building facility in an amusement park. The wave making machine of the building facility in the amusement park comprises a machine frame, a wave plate arranged on the machine frame, a pushing plate arranged below the wave plate, and an ejecting mechanism used for driving the pushing plate. The ejecting mechanism comprises an ejecting wheel and a restoring wheel. The ejecting wheel and the restoring wheel are vertically and coaxially arranged and have the same outer diameter. An ejecting block is arranged on the outer circle of the ejecting wheel. A lug is arranged on the outer circle of the restoring wheel. A cam shaft is transversely arranged on the lug. Four arc-shaped grooves are evenly distributed in the ejecting wheel in the circumferential direction. Screws are arranged in the arc-shaped grooves and used for locking the ejecting wheel and the restoring wheel together. A roller is arranged above the ejecting wheel. A connecting shaft is arranged in the center of the roller in a penetrating mode. The roller is as wide as the ejecting wheel. A shifting lever is further arranged on the connecting shaft. The shifting lever is located on the outer side of the restoring wheel and periodically shifted by the cam shaft. According to the wave making machine of the building facility in the amusement park, the water discharge amount of the wave plate can be adjusted through the change of the jacking time of an ejecting shaft, and accordingly the form and interval period of waves are adjusted.