Pressure flushing system and toilet

A pressure flushing system, comprising a first container, a second container and a communicating member that communicates with the first container and the second container;

• the first container is formed with a first water inlet and a drain;
• water flows into the first container from the first water inlet;
• and the water from the first container flows into the second container through the communicating member;
• gas in the first container and the second container is gradually compressed and stored in an upper part of the second container during a water intake process, and the compressed gas pushes the water in the first container and the second container to be discharged from the drain when draining;
• the pressure flushing system further comprises a water outlet box;
• the water outlet box comprises a water outlet box main body and a first one-way valve assembly;
• the water outlet box main body is formed with a water-passing cavity, a second water inlet, at least one water outlet and a vent, with the second water inlet, the water outlet and the vent all being in communication with the water-passing cavity, and the second water inlet is in communication with the drain;
• the first one-way valve assembly is arranged relative to the second water inlet to open or block the second water inlet;
• when the pressure flushing system finishes flushing, the first one-way valve assembly blocks the second water inlet;
• the vent is arranged at a top part of the water-passing cavity and is open to atmosphere.