The invention discloses a balance weight locking device for engineering machinery. The engineering machinery comprises a balance weight lifting base provided with a lift opening at the top; the balance weight locking device comprises a rocker arm (3) hinged on a rotary table (7) of the engineering machinery through a pin shaft (4); two end parts of the rocker arm (3) are respectively hinged with push rods (2); the tail ends of the two push rods (2) are respectively connected with locking components; and the rocker arm (3) rotates around the pin shaft (4) under the action of a power component to drive the two locking components to insert and separate from the lift opening. The invention also discloses the engineering machinery comprising the balance weight locking device. The engineering machinery and the balance weight locking device ensure that both sides of a balance weight are locked on the basis of reliably locking the balance weight.