The invention relates to acid soil conditioner and method of increasing the yield and improving the quality by applying same in pear, and belongs to the field of soil conditioner application. The soil conditioner is prepared from cyanamide slag and metal magnesium slag by the ratio of 40-60%.40-100 kg of soil conditioner is selected for one mu of pear field. The soil conditioner is applied before or after the full-bloom stage of a pear tree in early spring, the soil conditioner is weighed according to the amount, an annular furrow is dug at the 10 cm position within the water drip of a crown of the root of the pear tree, the annular furrow is 10 cm deep and 20 cm wide, the conditioner is uniformly spread in the furrow, soil is filled back to cover the conditioner, the pear tree is normally managed after the conditioner is processed, after the soil conditioner is applied for 90 days to the fruit mature stage of the pear tree, pear growth and yield conditions are investigated. The method can be used for improving soil and increasing the pH value of the acid soil and has the remarkable yield increasing effect.