Among the pre-Qin philosophers, Qin Guli is a representative figure of the Mohist school on a par with Mozi. Discussions of Qin Guli’s legal philosophy will help us better understanding the legal philosophy of pre-Qin Mohism. As a concept and principle for constructing a civilized order, Qin Guli’s philosophy of law can be summarized into four points: on the relation between ornamental accomplishments and natural plainness, he preferred the latter; on the relationship between oneself and things, he advocated self-sacrifice; on the relation between the strong and the weak, he advocated supporting the weak to resist the strong; and on the relation between the abstract and the concrete, he advocated that the latter are for conveying the former. Qin Guli’s legal philosophy has the characteristics of compatibility, pragmatism, and being action-oriented in pursuit of righteousness. He inherited and innovated Mozi’s legal philosophy, and his consideration and choice, as well as speech and action on civilized order and the construction ways are distinct and independent, possessing the quality of unifying knowledge and action.