TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: In the manual and electrical dual-purpose sprinkling-irrigating vehicle for pumping and transporting biogas dreg and biogas slurry, the piston pumping device comprises an inverted Y-shaped rocker arm (28), a motor (3), a speed reducer (36), a connecting bar (37), and a bent-end connecting bar (31); one bottom end of the inverted Y-shaped rocker arm (28) is hinged on the top of the exterior of the rear shell of the pump body (13); the other bottom end of the rocker arm (28) and the top end of the bent-end connecting bar (31) are movably hinged on the top end of the piston rod (11) by connecting bolts (14) mutually; the front end of the bottom of the vehicle box (23) is mounted with a motor (3); a spindle (33) of the motor (3) is connected with the speed reducer (36); a turntable (35) is mounted in front of the speed reducer (36); the bottom end of the connecting bar (37) is sleeved on a convex column (34) on the edge of the turntable (35) and the connecting bar (37) is capable of rotating together with the turntable (35); the top end of the connecting bar (37) is movably hinged with the bottom end of the bent-end connecting bar (31); the piston pumping device comprises a motor (3), a speed reducer (36), a connecting bar (37), and a bent-end connecting bar (31); the front end of the bottom of the vehicle box (23) is mounted with the motor (3); a spindle (33) of the motor (3) is connected with the speed reducer (36); a turntable (35) is mounted in front of the speed reducer (36); the bottom end of the connecting bar (37) is sleeved on a convex column (34) on the edge of the turntable (35); the connecting bar (37) is capable of rotating together with the turntable (35); the top end of the connecting bar (37) is movably hinged with the bottom end of the bent-end connecting bar (31); and the top end of the bent-end connecting bar (31) are movably hinged on the top end of the piston rod (11) by a connecting bolt (14).