The invention discloses a self-starting dual-module modem device and system. The self-starting dual-module modem device comprises a first modem, a first power module, a second modem, a second power module, a switching module and a self-starting monitoring module, the switching module comprises a power supply switching loop. The output end of the power supply switching loop comprises a normally closed contact and a normally open contact. The output end of the first power supply module is connected with the input end of the first modem, and the input end is connected with the normally-closed contact. The output end of the second power supply module is connected with the input end of the second modem, and the first input end is connected with the normally open contact. The output end of the first modem is connected with the output end of the second modem in parallel. One end of the self-starting monitoring module is connected with the output end of the first power module, and the other end is connected with the control end of the power switching loop. According to the invention, self-healing repair of interruption of the telecontrol special line channel can be completed when the modemfails, the defect eliminating operation efficiency is improved, and the on-site rush-repair operation of teams is reduced.