A control terminal automatic connection apparatus for an air circuit breaker, in an air circuit breaker comprising a cradle electrically connected to an electrical load and a power source on a circuit, and a main body that is movable to a connected position at which the main body is electrically connected to the cradle, a test position at which the main body is electrically disconnected from the cradle but a control power source is connected and a signal input/output is implemented, and a disconnected position at which the main body is electrically disconnected from the cradle, the control power source is not supplied and the signal input/output is not implemented, the control terminal automatic connection apparatus comprising: a spindle provided with a threaded portion and manually rotatable by being connected to a handle; a movable plate connected to the threaded portion of the spindle by meshing so as to be movable back and forth along the threaded portion of the rotating spindle; a rack gear installed on an upper surface of the movable plate so as to be movable back and forth along with the movable plate moving back and forth; a pinion gear (300a, 300b), provided with a teeth portion, installed at respective positions of the main body to be meshed with the rack gear and thus pivotable according to the rack gear moving back and forth; a cam provided with teeth portion meshed with the pinion gear, the cam being rotatable so as to transfer a rotation driving force from the pinion gear; a lever; a rod connected to the lever and thus movable in a vertical direction according to the rotation of the lever; a fixed control terminal module fixedly installed at the main body; and a movable control terminal module installed at the cradle, connected to the rod thus vertically movable along with the rod vertically moving and movable to a position for being connected to the fixed control terminal module of the main body and a position for being disconnected therefrom characterized in that the cam is provided with a protrusion for transferring the rotation driving force, and a radius of the teeth portion of the cam being greater than a radius of the teeth portion of the pinion gear (300a, 300b) so as to amplify a torque; and the lever has one end portion that can be connected to the cam or separated from the cam and rotatable by the rotation driving force transferred from the cam when connected to the cam, the lever being provided with a slot portion corresponding to the protrusion of the cam, the slot portion allowing the protrusion of the cam to be inserted within the slot portion to transfer the rotation driving force and to be separated from the slot to stop the rotation driving force. a spindle provided with a threaded portion and manually rotatable by being connected to a handle; a movable plate connected to the threaded portion of the spindle by meshing so as to be movable back and forth along the threaded portion of the rotating spindle; a rack gear installed on an upper surface of the movable plate so as to be movable back and forth along with the movable plate moving back and forth; a pinion gear (300a, 300b), provided with a teeth portion, installed at respective positions of the main body to be meshed with the rack gear and thus pivotable according to the rack gear moving back and forth; a cam provided with teeth portion meshed with the pinion gear, the cam being rotatable so as to transfer a rotation driving force from the pinion gear; a lever; a rod connected to the lever and thus movable in a vertical direction according to the rotation of the lever; a fixed control terminal module fixedly installed at the main body; and a movable control terminal module installed at the cradle, connected to the rod thus vertically movable along with the rod vertically moving and movable to a position for being connected to the fixed control terminal module of the main body and a position for being disconnected therefrom characterized in that the cam is provided with a protrusion for transferring the rotation driving force, and a radius of the teeth portion of the cam being greater than a radius of the teeth portion of the pinion gear (300a, 300b) so as to amplify a torque; and the lever has one end portion that can be connected to the cam or separated from the cam and rotatable by the rotation driving force transferred from the cam when connected to the cam, the lever being provided with a slot portion corresponding to the protrusion of the cam, the slot portion allowing the protrusion of the cam to be inserted within the slot portion to transfer the rotation driving force and to be separated from the slot to stop the rotation driving force.