Thickening device convenient for further concentrating salt-containing feed liquid

The thickener comprises a shell, a cover plate is fixedly arranged at the top of the shell, the cover plate is connected with a feeding pipe, the bottom of the shell is communicated with a salt leg, a discharging port is formed in the bottom of the salt leg, a stirring shaft is arranged at the axis position in the shell, and the stirring shaft is connected with the feeding pipe. The stirring shaft is in transmission connection with a driving device through a transmission device, the driving device is fixedly connected to the top of the cover plate, and a stirring paddle matched with the inner wall of the salt leg is arranged on the surface of the side wall, extending into the salt leg, of the stirring shaft; an annular settling tank is further arranged on the inner side wall of the shell, and an overflow opening communicated with the settling tank is formed in the outer side wall of the shell. According to the structure, the thickener convenient for further concentrating the salt-containing feed liquid furthe