The invention discloses a de-energizing and automatic tripping system for a direct-current screen, and relates to the technical field of direct-current screens. The power-losing and automatic tripping system comprises a storage battery, a protecting and measuring unit, a voltage detection unit, an on-off control unit and an intelligent control unit, wherein an output end of the voltage detection unit is connected with the storage battery; the storage battery is connected with the on-off control unit; the on-off control unit is connected with the protecting and measuring unit; the intelligent control unit is connected with the voltage detection unit and the on-off control unit; and a timing system is arranged in the intelligent control unit. When a switch is tripped and de-energized, timing is carried out through the system, and power supply of the protecting and measuring unit is automatically cut off after a certain period of time, so that the service life of the storage battery is ensured, and automatic control on the network is realized.