The invention relates to a fault early warning method of random power supply access equipment. The method comprises the following steps: 1, obtaining equipment state information, alarm information and maintenance record information in real time; 2, according to the equipment state information and the maintenance record information, calculating the expected service life of the equipment, a relational degree between alarms and faults, a relational degree between application frequency and the faults and a relational degree between the application frequency and the alarms, and accordingly, calculating a fault generation probability; and 3, determining whether the equipment expected life is smaller than and equal to zero, if so, emitting alarm signals for replacement of the equipment as early as possible, otherwise, determining whether the fault generation probability is greater than a preset value, and if so, carrying out early warning and pushing geological position information of the equipment and the types of possible faults to maintenance personnel. According to the invention, the types of the possible faults of the equipment and the fault probability are pushed timely, and maintenance is carried out before the faults are probably generated, such that the normal operation time of a random power supply is prolonged, and construction of the random power supply is further facilitated.