A system of wireless electronic devices for construction equipment and a maintenance system thereof are disclosed, in which various information used in an input and output unit, like modules of a construction work vehicle such as a hydraulic excavator, etc., are transmitted and received based on a wireless method, so that the use of wires can be significantly decreased. The wireless electronic system of a construction machine comprises at least one control panel which transmits a wireless signal for controlling each part of a construction machine in accordance with an operator's control; a main control device which receives a wireless signal from the control panel and transmits a wireless control signal for controlling a corresponding device; at least one auxiliary control device which performs input and output control, operation control, error detection, automatic control, etc. of each part of a construction machine in accordance with a wireless control signal from the main control device; and an internal wireless network which is constructed by the main control device for wireless data communication between the control panel, the main control device and the auxiliary control device.