The invention discloses a vectorization calculating method for polish rod power. The method comprises the steps that 1, basic information is acquired; 2, an irregular oil well indicator diagram is vectorized; 3, related data obtained after vectorization is measured; 4, related parameters are constructed; 5, a formula is substituted for calculating the polish rod power, wherein the stroke and the stroke frequency which are acquired in the step 1, the closed area measured in the step 3 and the force ratio and the stroke reducing ratio which are constructed in the step 4 are substituted into a polish power calculation formula, and then the polish rod power of a well is calculated. The method has the advantages that 39 production wells are measured in real time through the method, single-well production parameter adjusting is conducted in time, energy consumption is reduced, and the efficiency is improved; for verifying the data calculation accuracy rate of the method, verification is conducted and synchronously conducted with a mechanical extraction system efficiency tester test, and the final calculation result coincidence rate reaches 94%.