The invention relates to a method of rapidly detecting a magnetic performance of an amorphous strip. The method of rapidly detecting the magnetic performance of the amorphous strip includes the following steps. A plurality of amorphous strip segments with different length are taken as measuring samples. The thickness of each segment sample is measured, and then a resistance value of each segment sample is measured, and the electrical resistivity is worked out. Finally, a conclusion is obtained based on the thickness and the electrical resistivity of all segment samples, namely, the thickness d is equal to or less than 35MuMu, and the electrical resistivity Rho is equal to or more than 0.003Mu Omega or equal to or less than 0.025Mu Omega. Iron loss per unit Ps is equal to or less than 0.20W/kg and the exciting power Ss is equal to or less than 0.4 VA/Kg. By measuring the thickness and the electrical resistivity of the amorphous strip, the dynamic magnetic performance of the amorphous strip can be effectively and rapidly estimated and a monitoring manner is provided for stably and massively producing high-performance amorphous strips and the rate of inferior-quality products and wasted products due to unstable technology in a producing process are effectively reduced.