The invention discloses a children trammer, which comprises the following parts: trammer frame, first front wheel component, second front wheel component, first back wheel component and second back wheel component, wherein the trammer frame contains first side rack and second side rack on two sides; the transverse connecting rod is set between the first side rack and second side rack, which contains the first transverse rod on the first side rack and second transverse rod on the second side rack; one component of first and second transverse rods is cased on the other component; the first transverse rod slides along the length direction of the second transverse rod; the most of the first transverse rod is inserted in the pipe cavity of the second transverse rod or the most of the second transverse rod is inserted in the pipe cavity of the first transverse rod, which reduces the transmission bulk to keep trammer frame stable in the folding and expanding course. |