The invention discloses a wet leasing device used for a dyeing and sizing combination machine, comprising a leasing rod, a leasing rod driving mechanism, a leasing rod supporting mechanism and two permanent seats, wherein the leasing rod driving mechanism comprises a shaft sleeve, a drive shaft and a guide wheel; the shaft sleeve is fixedly connected to one permanent seat; the drive shaft is connected to the shaft sleeve by a bearing in a rotating mode; the guide wheel is fixedly connected to the drive shaft; one end of the leasing rod is detachably connected with the drive shaft; the leasingrod supporting mechanism comprises a support seat and a spring, wherein the support seat is connected to the other permanent seat by the bearing in a rotating mode; the spring is sleeved on the support seat; and the other end of the leasing rod is supported on the support seat. The wet leasing device does not need to be driven to control by the motor, can realize low-speed rotation without consuming additional energy, and is convenient to replace.