The utility model discloses a movable guardrail which comprises at least two sections of guardrail units and a connection rod used for connecting two adjacent guardrail units. Each guardrail unit comprises two end socket baffles and at least one cross beam fixed between the two end socket baffles, the reversed two external side faces of the two end socket baffles are respectively provided with at least one plugboard, and inserting holes are formed in the plugboards. The connection rods are inserted into the inserting holes of the plugboards of the two end socket baffles with opposite position of two adjacent sections of guardrail units. The movable guardrail is of a sectional type structure, the two adjacent guardrail units are connected by inserting the connection rods, the length of the guardrail can be increased or reduced according to specific circumstances of a construction area by construction staff, and the dismounting and the transportation of the guardrail are convenient. At least one cross beam is fixed between the two end socket baffles, and therefore the movable guardrail has high safety protecting capability.