The present invention provides a thermoplastic resin compound and a method for producing the thermoplastic resin compound; wherein, the thermoplastic resin compound has not only superior transparency and heat resistance performance but also expected characteristics such as mechanical strength and processability, etc.; especially, the thermoplastic resin compound has no foaming phenomenon in hot processing, and can be used to obtain finished product in pure bubble or silver stripe form. The thermoplastic resin compound comprises methacrylic resin with main chain in ring structure and 110 Celsius system or higher glass transition temperature and at least a metallic compound chosen from metal salt, metal complex, and metal oxide. The content of metallic compound in the compound is 10 swung dash 10,000ppm when converted to metal atom content with reference to the mass of the methacrylic resin. The method for producing the thermoplastic resin compound comprises: forming the ring structure by means of cyclizative condensation reaction with catalyst, and then adding deactivating agent against the catalyst, to obtain the methacrylic resin with main chain in ring structure and 110 Celsius system or higher glass transition temperature.