The invention provides a pulse-type forced fracture deflection fracturing method of an oil and gas well. Compared with a traditional deflection fracturing technology, the pulse-type forced fracture deflection fracturing method of the oil and gas well is advantageous in that the problems such as pump stopping and discontinuous construction due to the fact that the construction pressure reaches themaximum pressure limited by construction are not required to be avoided, and on the contrary, utilizing the high net pressure value formed in a fracture when the construction pressure reaches the maximum pressure limited by construction is presented creatively; and due to the fact that the net pressure value is higher than the difference value of the maximum principal stress and the minimum principal stress required by fracture deflection, the fracture is forced to conduct deflection, and the deflection success rate can be up to 100%.