Multifunctional agricultural trencher for paddy field

The invention belongs to the field of agricultural machinery, and particularly relates to a multifunctional agricultural trencher for paddy fields, which comprises a chassis assembly, a frame assembly is mounted on the chassis assembly in a matched manner, a power output assembly, an operation table assembly and a trenching assembly are mounted on the frame assembly in a matched manner, and the chassis assembly comprises a front wheel bridge, a rear wheel bridge, two front wheels and two rear wheels. The wheel bridge is in transmission fit with the power output assembly and comprises a left wheel bridge arm, a right wheel bridge arm and a bridge body connected between the upper ends of the two wheel bridge arms, the left wheel bridge arm and the right wheel bridge arm of the front-end wheel bridge are connected with two front wheels respectively, and the left wheel bridge arm and the right wheel bridge arm of the rear-end wheel bridge are connected with two rear wheels respectively. The wheel axle drives the