The present disclosure provides a current adjustment circuit. The current adjustment circuit includes a lighting sub-circuit, a dimming switch disposed in the lighting sub-circuit, a switch control sub-circuit connected to the dimming switch and the lighting sub-circuit, and a time control sub-circuit connected to the switch control sub-circuit. Time of switch-off period in a switching cycle of the current adjustment circuit is adjusted under control of the time control sub-circuit and the switch control sub-circuit. Brightness of the current adjustment circuit is adjusted based on the output current of the current adjustment circuit. The present disclosure may reduce or even eliminate influence of factors such as circuit parasitic parameters on an LED light source, ensure consistency of each light source, and optimize display effect of the LED light source.