Calandria negative pressure controller

The utility model relates to a calandria negative pressure controller, which relates to a pressure controller for irrigating soils. The utility model aims to provide the calandria negative pressure controller with simple structure, low cost, small volume, and reaction sensitivity. The calandria negative pressure controller comprises an upper end cover, a lower end cover and a plurality of pressure regulating groups in parallel, wherein the pressure regulating groups are located between the upper end cover and the lower end cover; each pressure regulating group comprises a calandria, a water inlet connecting pipe and a water outlet connecting pipe; openings are respectively processed on the left part and the right part of the top part of the calandria; the left opening is connected with the water inlet connecting pipe; the right opening is connected with the water outlet connecting pipe; the water outlet connecting pipe is connected with the water inlet connecting pipe of an adjacent pressure regulating group;