The utility model discloses a multifunctional alarm and energy conservation electronic device for decorative chromium plating, which goes into a plating bath by a rack and switches on the loop in the relay and makes the relay operate for realizing automatic timing, automatic alarm, automatic switching-on and automatic closing of the rectification power supply; the utility model makes the rectification device run completely without empty load loss and eliminates the bad contact of racks causing the phenomenon of products 'changing gray '. The utility model ensures the stability of the quality of products.