The invention discloses a wall surface rainwater collection and utilization apparatus. A buffer unit comprises a buffer pipe and a water baffle plate, wherein the water baffle plate is arranged on oneend of the buffer pipe, and the length of the water baffle plate is greater than the diameter of the buffer pipe; a water storage unit comprises a water storage pipe and a water blocking plate, the water storage pipe is communicated with the buffer pipe; the water blocking plate is arranged on one side of the water storage pipe close to the buffer pipe, the water baffle plate extends into the water storage pipe, and the water blocking plate is located below the water baffle plate; a planting unit comprises a planting net and a planting matrix, the planting net is arranged in the water storagepipe, the planting matrix is arranged in the planting net, and plants are planted in the planting matrix; a water outlet unit comprises a water outlet pipe, the water outlet pipe is communicated withthe water storage pipe, and the water outlet pipe is connected below the buffer pipe; and the water baffle plate is located at the joint of the water outlet pipe and the buffer pipe, and the water blocking plate is located at the joint of the water outlet pipe and the water storage pipe. By virtue of the technical scheme of the invention, the high-load pollution at the initial stage of rainwatercan be reduced, the three-dimensional greening area can be enlarged, and a certain landscape and ecological effect can be achieved..