The invention relates to a simplex intercom mobile terminal and a method for preventing missed answering of an incoming call, and solves the technical problems of missed answering of calls working atother frequency terminals and weak confidentiality. A second receiving unit, a frequency scanning preset unit and a number storage unit are additionally adopted; the control unit is in bidirectional connection with the frequency scanning preset unit, the output of the frequency scanning preset unit is connected with the second receiving unit to complete data transmission, the output of the secondreceiving unit is connected with the number storage unit, and the number storage unit is in bidirectional connection with the control unit; and the control unit is further in bidirectional connectionwith the transmitting unit and the first receiving unit, so that the problem is better solved, and the method can be applied to simplex intercom mobile communication.