Spondyloenchondrodysplasia (SPENCD) is a rare autosomal recessive skeletal dysplasia caused by biallelic mutations in the ACP5 gene that encodes tartrate-resistant acid phosphatase (TRAP). The extra-osseous phenotype of SPENCD is extremely pleiotropic and is characterized by neurological impairment and immune dysfunction. This phenotype can mimic systemic lupus erythematosus. Herein, we report a child presented with systemic lupus erythematosus-like symptoms, including multisystem inflammation, autoimmunity, and immunodeficiency, but was subsequently diagnosed as SPENCD.