A squeeze flat mop cleaning tool having an adjustable squeeze opening, comprising a mop bucket and a flat mop, wherein the flat mop comprises a mop stick and a flat mop head movably connected to the mop stick, and a wiper is provided on the flat mop head; the mop bucket has a squeezing area, a squeeze device is mounted on the mop bucket, and during squeezing, the flat mop head is configured to be rotated to a state suitable for squeezing; the squeeze device comprises a scraper plate used for squeezing the wiper on the flat mop head, and a support member opposite the scraper plate, and a squeeze opening is formed between the scraper plate and the support member; during squeezing, the flat mop head is inserted into the squeeze opening in the squeezing area, and the wiper and the scraper plate are moved and squeezed relative to each other, so as to squeeze the wiper; characterized in that: the scraper plate is configured to rotate relative to the mop bucket, and a size of the squeeze opening can be changed by a rotation of the scraper plate; when the flat mop head is pressed downwards, the wiper is configured to drive the scraper plate to rotate downwards, so that the scraper plate is positioned in a narrow position relative to the support member, thereby the size of the squeeze opening is reduced, and a friction force to the wiper is enlarged to facilitate squeezing the wiper; and when the flat mop head is pulled upwards, the wiper is configured to drive the scraper plate to rotate upwards, thereby the size of the squeeze opening is enlarged, thereby a friction force between the scraper plate and the wiper is reduced, and meanwhile preventing the mop bucket from being lifted up when the flat plate mop is lifted upwards. the mop bucket has a squeezing area, a squeeze device is mounted on the mop bucket, and during squeezing, the flat mop head is configured to be rotated to a state suitable for squeezing; the squeeze device comprises a scraper plate used for squeezing the wiper on the flat mop head, and a support member opposite the scraper plate, and a squeeze opening is formed between the scraper plate and the support member; during squeezing, the flat mop head is inserted into the squeeze opening in the squeezing area, and the wiper and the scraper plate are moved and squeezed relative to each other, so as to squeeze the wiper; characterized in that: the scraper plate is configured to rotate relative to the mop bucket, and a size of the squeeze opening can be changed by a rotation of the scraper plate; when the flat mop head is pressed downwards, the wiper is configured to drive the scraper plate to rotate downwards, so that the scraper plate is positioned in a narrow position relative to the support member, thereby the size of the squeeze opening is reduced, and a friction force to the wiper is enlarged to facilitate squeezing the wiper; and when the flat mop head is pulled upwards, the wiper is configured to drive the scraper plate to rotate upwards, thereby the size of the squeeze opening is enlarged, thereby a friction force between the scraper plate and the wiper is reduced, and meanwhile preventing the mop bucket from being lifted up when the flat plate mop is lifted upwards. the scraper plate is configured to rotate relative to the mop bucket, and a size of the squeeze opening can be changed by a rotation of the scraper plate; when the flat mop head is pressed downwards, the wiper is configured to drive the scraper plate to rotate downwards, so that the scraper plate is positioned in a narrow position relative to the support member, thereby the size of the squeeze opening is reduced, and a friction force to the wiper is enlarged to facilitate squeezing the wiper; and when the flat mop head is pulled upwards, the wiper is configured to drive the scraper plate to rotate upwards, thereby the size of the squeeze opening is enlarged, thereby a friction force between the scraper plate and the wiper is reduced, and meanwhile preventing the mop bucket from being lifted up when the flat plate mop is lifted upwards.