Floating-point number square root calculation method and floating-point number calculation module

According to the floating-point number square root calculation method and the floating-point number calculation module provided by the embodiment of the invention, the calculation delay is relatively short, the throughput rate is high, an optimized rounding method is correspondingly provided, and an accurate result meeting an IEEE754 standard rounding mode can be output. In the floating-point number square root calculation method, the mantissa of the square root of a first floating-point number is determined by determining the square root of a target mantissa, the target mantissa comprises the mantissa of the first floating-point number, and the first floating-point number is a normal floating-point number. The high bit width part and the low bit width part of the square root of the target mantissa are calculated respectively, the square root of the target mantissa is determined, the decimal part of the square root of the target mantissa is the mantissa of the square root of the first floating-point number, a