A single-electron collision model is established according to the laser-electron interaction equation and the electron radiation power equation, and the three-dimensional spatial distribution characteristics of the electron oscillation radiation under the action of circularly polarized tightly focused laser pulses of different intensities are studied in detail with the help of MATLAB software simulation. The results show that the spatial radiation maximum of the colliding electrons increases with the increase of the laser intensity. From the three-dimensional spatial image characteristics, with the increase of laser intensity, the three-dimensional angle enclosed by the radiation cone surface expands continuously, when the amplitude peak from linear to nonlinear transition, the radiation value in the direction of the polar angle changes from smooth to appearing ripple, and the azimuthal direction changes from uniform to nonuniform, when the normalized laser intensity reaches 10, the radiation direction is approximately perpendicular to the direction of motion in a plane.