Manual and automatic switching mechanism of automatic change-over switch

The invention relates to a manual-automatic switching mechanism of an automatic change-over switch, which comprises a mechanism cover, a large turntable, a manual knob and a lock plate, the large turntable is arranged on the mechanism cover to rotate, the mechanism cover is provided with a knob hole at an eccentric position below the large turntable, the manual knob is arranged in the knob hole, and an unlocking hole corresponding to the knob hole is formed on the large turntable. The lock plate is arranged on one side of the mechanism cover to move, a lock tongue extending towards the large rotary disc is formed on the lock plate, a lock groove matched with the lock tongue is formed in the periphery of the large rotary disc, and the lock plate drives the lock tongue to enter and exit from the lock groove when moving. Rotation of the large rotating disc is limited through the spring bolt to prevent unlocking and limit manual control, when manual control is needed, unlocking can be achieved through the lock pl