The invention discloses an external U-shaped liquid meter which comprises a positive pressure tube, a negative pressure tube, a valve 1, a valve 2, a regulating valve 3, a valve 4, a valve 6, a U-shaped glass tube 5 and an antifreezing solution indicator arranged in the U-shaped glass tube. When a liquid level moves up and down, the antifreezing solution indicator in the U-shaped glass tube moves up and down, an operator knows the height of the liquid level through a difference value of liquid levels at two sides in the U-shaped tube. Because a liquid level indicator in the part of the U-shaped liquid meter exposed out of a container resists low temperature, the problem of freezing blockage of the conventional glass tube liquid level meter and the conventional magnetic turning column liquid level meter is avoided.