The sliding vane control structure of the variable volume cylinder is provided on the lower side of the sliding vane (11), and has a first position where the sliding vane (11) can be locked and a second position where the sliding vane (11) can be separated from the sliding vane (11). A pin (113, 213) is provided, a low pressure passage (115, 215) is provided below the pin (113, 213), and a face seal structure is provided between the pin (113, 213) and the low pressure passage (115, 215). And the pin (113, 213) is in the second position, a face seal is formed at the lower end of the pin (113, 213). The sliding vane control structure is provided with a face seal structure, the sealing effect by the face seal is far superior to the gap seal, greatly reduces the amount of refrigerant leakage, and the variable volume cylinder is in the operation mode. In case of improving the efficiency of the compressor and optimizing the performance of the compressor. It further includes a variable displacement cylinder and a variable displacement compressor provided with the sliding vane control structure. [Selection] Figure 4
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