The invention provides a multifunctional impulse type well borer, which comprises a bay, a main generator, a main drive shaft, and a clutch assembly, a front-wheel-drive generator, a rear-wheel-drive generator, and a front-wheel-steering generator, a front-wheel-drive shaft with a front bridge tooth packet and a rear-wheel-drive shaft with a rear axle tooth packet are respectively mounted on the front portion and the rear portion of the bay, a front wheel and a rear wheel are respectively mounted on the front-wheel-drive shaft and the rear-wheel-drive shaft, an output shaft of a front wheel speed changing box which is connected with an output shaft of the front-wheel-drive generator is connected with a front-wheel-drive transmission shaft in the front bridge tooth packet, a front wheel steering balancing holdfast tube body whose bottom end is connected on a casing body of the front bridge tooth packet is sleeved on the outer of the speed changing box and the front-wheel-drive transmission shaft, and the front wheel steering balancing holdfast tube body is driven by the front-wheel-steering generator through a front-wheel-steering transmission mechanism, a rear axle drive shaft is driven by the rear-wheel drive generator through a rear axle gear wheel drive mechanism, and an input shaft of a rear axle tooth packet is connected with a rear axle drive shaft. The invention has the advantages of time saving and labor saving, strong climbing property, stability, flexible steering, and big turning radius.