Heightened guardrail and safety door fence

The utility model discloses a heightened guardrail which comprises a main guardrail body, a side guardrail body and a locking mechanism. When the height of the safety door fence is not enough, the main fence body of the heightened fence is installed at the upper end of an existing safety door fence through the door fence installation structure, then the left-right position of the side fence body relative to the main fence body is adjusted, and the overall width of the main fence body and the side fence body is made to be matched with the width of an aisle. And finally, the relative positions of the main fence body and the side fence bodies are locked through the locking mechanism, so that the heightening of the existing safety door fence is completed. By adopting the heightened guardrail, the whole safety door fence does not need to be replaced, the cost is reduced, and the waste of resources is reduced; due to the fact that the extending width of the side fence bodies relative to the main fence body can be a