An interlocking control circuit and a double-tower type crane. The interlocking control circuit is applied to the double-tower type crane. The double-tower type crane comprises a primary tower (1) and a secondary tower (2). The interlocking control circuit comprises: a primary tower control unit (100) provided on the primary tower; a secondary tower control unit (200) provided on the secondary tower; an interlocking switching unit (300) provided on the primary tower and separately communicating with the primary tower control unit and the secondary tower control unit. The interlocking switching unit is used for receiving a locking signal externally input, and sending the locking signal to the primary tower control unit and the secondary tower control unit. Under the condition that the locking signal indicates a first state, the primary tower control unit is used for controlling the primary tower to start, and the secondary tower control unit is used for forbidding the secondary tower to start; and under the condition that the locking signal indicates a second state, the primary tower control unit is used for forbidding the primary tower to start, and the secondary tower control unit is used for controlling the secondary tower to start. The described circuit design implements electric interlocking of the primary tower and the secondary tower, and improves the operation safety of the double-tower type crane.