The invention relates to an oil and gas field production increasing method and device for breaking rock based on the sound wave focusing resonance technology. A power supply cable is connected with a power module and converted into DC (direct current) power; the DC power is provided to a drive module by driving the power supply cable; the drive module generates a high-voltage pulse signal with fixed frequency, and the frequency of the high-voltage pulse signal approaches to the natural frequency of the rock to be broken; the high-voltage pulse signal enables a sound wave focusing transducer to emit a sound wave signal through a drive signal cable; the sound wave signal is focused to the focus through a parabolic sphere; and the position of the focus is adjusted so that the sound wave signal falls on the rock to be broken. According to the invention, the sound wave energy is focused in the area of the rock to be broken through frequency conversion and focusing according to the resonance principle so that the rock is broken under resonance; the method and device provided by the invention can generate artificial cracks in a fixed range at fixed underground positions and can be used for increasing the production of a contaminated well and changing the stress state of the rock, thereby providing favorable conditions for the large production increasing reconstruction measures (for example, hydraulic fracturing).