Dewatering box and dewatering system for working face of foundation pit

The invention relates to a dewatering box and a dewatering system for a working face of a foundation pit. The dewatering box comprises a box body with a tip formed at the bottom, an internal communication channel, a drainage pipe and a controller; the inner cavity of the box body is divided into a water filtering cavity and a water collecting cavity through an inner partition plate; the water filtering cavity is used for filling water filtering materials, and water inlet holes are formed in the upper part of side wall, corresponding to the water filtering cavity, of the box body; the internalcommunication channel is arranged at the bottom of the inner partition plate, communicates with the water filtering cavity and the water collecting cavity, and is used for the water filtered by the water filtering cavity to flow into the water collecting cavity; the drainage pipe communicates with the water collecting cavity and is used for communicating with a water pump on the ground, so as to pump the collected water i