Standard substance for measuring flow rate of plastic melt as well as preparation method and application of standard substance

The invention discloses a standard substance for measuring the flow rate of a plastic melt as well as a preparation method and application of the standard substance. The standard substance for measuring the plastic melt flow rate comprises the following components in parts by weight: 40-50 parts of PE resin, 70-80 parts of a powder filler and 2-4 parts of an antioxidant, wherein the melt flow rate of the PE resin is less than or equal to 8g/10min under the conditions that the temperature is 190 DEG C and the load is 2.16 Kg. The standard substance for plastic melt flow rate determination has high melt flow rate test result stability at the temperature of 190 DEG C or below, the F value of variance analysis is in a non-significant level, the standard substance can meet low-temperature and low-melt flow rate test verification requirements after being stored for at least 6 months, the preparation method is simple, the cost is low, and the standard substance is suitable for industrial production. The device is su