The invention discloses a Stirling pulse tube refrigerator connected with a displacer. A cold end of a first-stage pulse tube refrigerator is connected with one end of the displacer; the other end of the displacer is connected with a room temperature end of a second-stage pulse tube refrigerator; one or more second-stage pulse tube refrigerators are connected in parallel, or one or more second-stage pulse tube refrigerators are connected in series; the displacer comprises a free single-piston type displacer, a single-piston supporting type displacer and a double-piston supporting type displacer; the free single-piston type displacer is provided with a piston only; a piston of the single-piston supporting type displacer is arranged on one side of an elastic part, and a connecting rod is arranged on the piston and is connected with the elastic part; and pistons of the double-piston supporting type displacer are arranged on two sides of the elastic part, and a connecting rod is arranged between the two pistons and is connected with the elastic part. Compared with the conventional multi-stage pulse tube refrigerator, the Stirling pulse tube refrigerator is connected with the displacer, so that the system is more compact, phase modulation is flexible and accurate, the loss of acoustical power transmitted among stages is reduced, more acoustical power is transmitted to the next stage, large cold quantity is obtained, and the whole system operates more efficiently.