Hand-operated anti-suck-back slurry suction device

The invention provides a hand-operated anti-suck-back slurry suction device which comprises a hand-operated device (1), a power mechanism (2), a height adjusting support (4) and a plurality of guide pipes (6), and the hand-operated device (1) comprises a fixed base (101), a rotating shaft (103), an outer rotating disc (104), an inner rotating disc (105), a crankshaft connecting rod connecting shaft (106) and a triangular support (107); the power mechanism (2) is fixedly installed on the fixing support (8) and comprises a negative pressure chamber (201), a slurry chamber (202), a screw rod (204) and a bolt pin fixing baffle (209). The screw rod (204) penetrates through the height adjusting support (4); the power mechanism (2) is connected with the hand-cranking device (1) through the crankshaft connecting rod (3); and the guide pipe (6) is arranged below the power mechanism (2) and is connected with the screw rod (204) through the joint piston (5). The technical problem that mud at the bottom of a hole is diff