Abstract: A mobile kitchen cart assembly has a cart and two supporting stands respectively disposed at two sides of the cart. The cart includes a cart body, a cover plate, and multiple casters disposed at a bottom of the cart body. The cart body includes a carrier portion having an accommodating space and an operational portion located above the carrier portion and having an upper opening communicating with the accommodating space and a knife holder for holding knives. The cover plate covers the upper opening of the operational portion. The mobile kitchen cart assembly provides adequate operational space and a counter top at a suitable height by arrangement of the cart body with the cover plate and the two supporting stands.