The invention discloses an oil gas production increasing device and method based on combination of liquid electric pulse shock wave injection increase and chemical agent injection increase. The combination production increasing device is mainly composed of a well operating instrument 1, coiled tubing 2 and a liquid electric pulse shock wave emitter 3. According to the oil gas production increasingmethod, liquid electric pulse shock wave injection increase and chemical agent injection increase are combined for operation, shock wave operation is conducted on an oil gas well perforation sectionand rock strata nearby the oil gas well perforation section, perforation plugging objects are physically crushed, micro-cracks of the nearby rock strata are increased, and permeability is improved. Synchronously-injected chemical agents can be transmitted to the deeper rock strata under the effect of shock waves and meanwhile can better dissolve the viscous plugging objects under the disturbance effect of the shock waves, and permeability of the rock strata is improved. The operation steps are simple, the advantage of shock wave production increasing and chemical production increasing can be combined, the device and method are suitable for vertical and horizontal wells, the production increasing effect is remarkable, and the effective time of shock wave production increasing and chemical production increasing which are simplex in function effect is longer.