The invention provides a method and device for evaluating a stratum hydrofracturing effect. The method comprises the steps that array acoustic logging is carried out in a depth interval, and dipole acoustic logging data at different azimuths is built; the dipole acoustic logging data at different azimuths is subjected to filtering processing and normalization processing, scattered wave energy envelopes before and after fracturing are calculated, and the dipole acoustic logging shear wave velocity difference before and after fracturing and the difference of scattered wave energy are utilized for being united to evaluate the circum-well fracturing effect. Compared with the existing fracturing effect evaluating effect, the method has the advantages that the fracturing effect in the shaft direction can be evaluated, and the fracturing effect within the range of tens of meters in the circum-well radial direction can be evaluated.