The invention, which relates to the transfusion bag inspection field of the pharmaceutical industry, provides a novel welding quality inspection apparatus of a transfusion bag and an inspection method using the same. The apparatus comprises a temperature-consistent water tank; and a pressure control unit is arranged at one side of the temperature-consistent water tank. A triangular support is arranged inside the water tank; the top of the support is connected with the inner wall of the water tank by a rotary knob; a base plate is arranged at the bottom of the support; and a cylinder is connected to the support. According to the inspection apparatus based on the structure, a transfusion bag can be placed on the base plate directly; and after the bag is compressed by a piston connected with the cylinder, the whole support is rotated, so that an included angle of 30 to 75 degrees is formed between the bag body and the horizontal direction and thus the air in the bag is centralized to the position near the bag mouth tube or bag bottom; welding positions at the two sides of the bag body can also be inspected and thus leakage can be inspected by observing whether a continuous bubbling phenomenon occurs. Compared with the prior art, the inspection based on the provided method becomes visual, so that the detection rate of the micro leakage phenomenon is substantially improved.