The invention discloses a liquid crystal polyester composition. The content of the metal strontium element in the liquid crystal polyester composition is 0.1-300ppm. A test method of the weight content of the metal strontium element comprises the following steps: drying the liquid crystal polyester composition at 120DEG C for 4h, taking 1g of a sample to be processed, adding nitric acid and hydrogen peroxide, heating the obtained mixture for 2h, and continuously adding nitric acid and hydrogen peroxide in the heating process; taking the obtained digested sample after digestion of the sample is completed, and analyzing the weight content of the metal strontium element in the sample through adopting a fully-automatic inductively coupled plasma atomic emission spectrometer 720ES from Agilent Technologies. 0.1-300Ppm of the metal strontium element is added to the formula of the liquid crystal polyester composition, so the obtained liquid crystal polyester composition has improved high temperature resisting stability and welding foam resistance.