The invention relates to a method for increasing the light dydrocarbon recovery rate of oil-field associated gas through the shallow condensing recovery, belonging to the technical field of petrochemical engineering. The method is characterized in that the traditional shallow condensing technology is coupled with the new membrane separation technology; and an expander is also used to perform power recovery to the output dry gas. A gas separation membrane unit can have a hollow fiber, plate frame or spiral wound type structure. When gaseous products are separated by a membrane component, C3<+>component firstly passes through the membrane to reach the other side; the concentrated C3<+> gas is on the permeate side; the gas is circulated before sent back to a compressor; and residual gas expands to reach the required pressure of dry gas output, and the cold energy generated through is used for heat exchange. The invention has the following effects and benefits: under the condition of notreducing the condensing temperature, the light dydrocarbon recovery rate of the shallow condensing equipment can be obviously increased and the energy of the output dry gas can be effectively recycled through the introduction of the expander, thus the economic benefit of the oil field can be greatly increased.