Small-sized door opener

The utility model discloses a small-sized door opener. A supporting head which is downwards connected with an oil cylinder is arranged at the upper part of the small-sized door opener, a piston rod is arranged inside the oil cylinder, the bottom of the oil cylinder is connected with a large-bottom foot, the bottom of the piston rod is connected with a small-bottom foot through a tension spring, and one side of the supporting head is connected with an opener connector component which is communicated with the oil cylinder. The door opener disclosed by the utility model has the effects that the opener facilitates rescue implementation in a narrow and small space, can be applied to lifting, supporting, and automatic resetting, and is small in size, light in weight, and simple and convenient in parts assembly.