The invention discloses a solar greenhouse with two film and two arch frames. The solar greenhouse comprises outer arch frames and inner arch frames (6). Each of the outer arch frame comprises an outer arch frame upper chord welded pipe (1) and an outer arch frame lower chord round steel (3) connected through round steels (2) which are arranged in Z shapes, the outer arch frame upper chord welded pipes (1) are phi 32*2.5 welded pipes, and the outer arch frame lower chord round steels (3) are phi 12 round steel, and space of each pair of the outer arch frames is 1m; and the inner arch frames (6) are phi 32*2.5 welded pipes, space of each pair of the inner arc frames is 2m, and space between the inner arch frames and the outer arch frames is between 300m and 400m. According to the solar greenhouse, the wind-resistance is high, the thermal insulation property is good, the solar greenhouse is solid and durable; and planted melon, fruit and vegetables are good in taste and commercial properties. The utilization effect of the solar greenhouse is obviously better than the utilization effects of other solar greenhouses.